diff --git a/verilog/dv/caravel/defs.h b/verilog/dv/caravel/defs.h
index f255737..9707d0e 100644
--- a/verilog/dv/caravel/defs.h
+++ b/verilog/dv/caravel/defs.h
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #ifndef _STRIVE_H_
diff --git a/verilog/dv/caravel/mgmt_soc/gpio/gpio.c b/verilog/dv/caravel/mgmt_soc/gpio/gpio.c
index 0f9e61b..16503bb 100644
--- a/verilog/dv/caravel/mgmt_soc/gpio/gpio.c
+++ b/verilog/dv/caravel/mgmt_soc/gpio/gpio.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/hkspi/hkspi.c b/verilog/dv/caravel/mgmt_soc/hkspi/hkspi.c
index 036c40f..8a5155a 100644
--- a/verilog/dv/caravel/mgmt_soc/hkspi/hkspi.c
+++ b/verilog/dv/caravel/mgmt_soc/hkspi/hkspi.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/hkspi/hkspi_tb.v b/verilog/dv/caravel/mgmt_soc/hkspi/hkspi_tb.v
index 73be020..4702574 100644
--- a/verilog/dv/caravel/mgmt_soc/hkspi/hkspi_tb.v
+++ b/verilog/dv/caravel/mgmt_soc/hkspi/hkspi_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*	
diff --git a/verilog/dv/caravel/mgmt_soc/mem/mem.c b/verilog/dv/caravel/mgmt_soc/mem/mem.c
index e53abad..0309bb5 100644
--- a/verilog/dv/caravel/mgmt_soc/mem/mem.c
+++ b/verilog/dv/caravel/mgmt_soc/mem/mem.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl.c b/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl.c
index 0077a90..d92618b 100644
--- a/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl.c
+++ b/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl_tb.v b/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl_tb.v
index 8c12a8a..d1950ed 100644
--- a/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl_tb.v
+++ b/verilog/dv/caravel/mgmt_soc/mprj_ctrl/mprj_ctrl_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru.c b/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru.c
index 68c58b7..adf5f88 100644
--- a/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru.c
+++ b/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru_tb.v b/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru_tb.v
index 5a5823d..099b814 100644
--- a/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru_tb.v
+++ b/verilog/dv/caravel/mgmt_soc/pass_thru/pass_thru_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*	
diff --git a/verilog/dv/caravel/mgmt_soc/perf/perf.c b/verilog/dv/caravel/mgmt_soc/perf/perf.c
index 55d680c..e4e7f58 100644
--- a/verilog/dv/caravel/mgmt_soc/perf/perf.c
+++ b/verilog/dv/caravel/mgmt_soc/perf/perf.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/pll/pll.c b/verilog/dv/caravel/mgmt_soc/pll/pll.c
index d0441d3..ee3fc7b 100644
--- a/verilog/dv/caravel/mgmt_soc/pll/pll.c
+++ b/verilog/dv/caravel/mgmt_soc/pll/pll.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/pll/pll_tb.v b/verilog/dv/caravel/mgmt_soc/pll/pll_tb.v
index be1b1c4..5c0316f 100644
--- a/verilog/dv/caravel/mgmt_soc/pll/pll_tb.v
+++ b/verilog/dv/caravel/mgmt_soc/pll/pll_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/caravel/mgmt_soc/storage/storage.c b/verilog/dv/caravel/mgmt_soc/storage/storage.c
index 8096ec1..375b090 100644
--- a/verilog/dv/caravel/mgmt_soc/storage/storage.c
+++ b/verilog/dv/caravel/mgmt_soc/storage/storage.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl.c b/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl.c
index b54414c..6c90647 100644
--- a/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl.c
+++ b/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl_tb.v b/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl_tb.v
index 743d58c..9912c3d 100644
--- a/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl_tb.v
+++ b/verilog/dv/caravel/mgmt_soc/sysctrl/sysctrl_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/caravel/mgmt_soc/timer/timer.c b/verilog/dv/caravel/mgmt_soc/timer/timer.c
index 9ab89f0..5d1000c 100644
--- a/verilog/dv/caravel/mgmt_soc/timer/timer.c
+++ b/verilog/dv/caravel/mgmt_soc/timer/timer.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/timer2/timer2.c b/verilog/dv/caravel/mgmt_soc/timer2/timer2.c
index aa59530..ab06d99 100644
--- a/verilog/dv/caravel/mgmt_soc/timer2/timer2.c
+++ b/verilog/dv/caravel/mgmt_soc/timer2/timer2.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/mgmt_soc/uart/uart.c b/verilog/dv/caravel/mgmt_soc/uart/uart.c
index b83322b..0dea68a 100644
--- a/verilog/dv/caravel/mgmt_soc/uart/uart.c
+++ b/verilog/dv/caravel/mgmt_soc/uart/uart.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/stub.c b/verilog/dv/caravel/stub.c
index 28090ca..c89330c 100644
--- a/verilog/dv/caravel/stub.c
+++ b/verilog/dv/caravel/stub.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 void putchar(char c)
diff --git a/verilog/dv/caravel/user_proj_example/io_ports/io_ports.c b/verilog/dv/caravel/user_proj_example/io_ports/io_ports.c
index 7e45bf4..d570ee1 100644
--- a/verilog/dv/caravel/user_proj_example/io_ports/io_ports.c
+++ b/verilog/dv/caravel/user_proj_example/io_ports/io_ports.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/user_proj_example/io_ports/io_ports_tb.v b/verilog/dv/caravel/user_proj_example/io_ports/io_ports_tb.v
index 4999fd4..b155c3d 100644
--- a/verilog/dv/caravel/user_proj_example/io_ports/io_ports_tb.v
+++ b/verilog/dv/caravel/user_proj_example/io_ports/io_ports_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/caravel/user_proj_example/la_test1/la_test1.c b/verilog/dv/caravel/user_proj_example/la_test1/la_test1.c
index a28540f..7bea99e 100644
--- a/verilog/dv/caravel/user_proj_example/la_test1/la_test1.c
+++ b/verilog/dv/caravel/user_proj_example/la_test1/la_test1.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/user_proj_example/la_test1/la_test1_tb.v b/verilog/dv/caravel/user_proj_example/la_test1/la_test1_tb.v
index d3d74d7..1fbf764 100644
--- a/verilog/dv/caravel/user_proj_example/la_test1/la_test1_tb.v
+++ b/verilog/dv/caravel/user_proj_example/la_test1/la_test1_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/caravel/user_proj_example/la_test2/la_test2.c b/verilog/dv/caravel/user_proj_example/la_test2/la_test2.c
index 2bd97f2..cb1f04d 100644
--- a/verilog/dv/caravel/user_proj_example/la_test2/la_test2.c
+++ b/verilog/dv/caravel/user_proj_example/la_test2/la_test2.c
@@ -12,6 +12,7 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "../../defs.h"
diff --git a/verilog/dv/caravel/user_proj_example/la_test2/la_test2_tb.v b/verilog/dv/caravel/user_proj_example/la_test2/la_test2_tb.v
index 17adcea..f1dcb54 100644
--- a/verilog/dv/caravel/user_proj_example/la_test2/la_test2_tb.v
+++ b/verilog/dv/caravel/user_proj_example/la_test2/la_test2_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/dummy_slave.v b/verilog/dv/dummy_slave.v
index add6694..4b12665 100644
--- a/verilog/dv/dummy_slave.v
+++ b/verilog/dv/dummy_slave.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module dummy_slave(
diff --git a/verilog/dv/wb_utests/gpio_wb/gpio_wb_tb.v b/verilog/dv/wb_utests/gpio_wb/gpio_wb_tb.v
index 06b729b..a8eedda 100644
--- a/verilog/dv/wb_utests/gpio_wb/gpio_wb_tb.v
+++ b/verilog/dv/wb_utests/gpio_wb/gpio_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/intercon_wb/intercon_wb_tb.v b/verilog/dv/wb_utests/intercon_wb/intercon_wb_tb.v
index 0f1e1f3..a4eb60c 100644
--- a/verilog/dv/wb_utests/intercon_wb/intercon_wb_tb.v
+++ b/verilog/dv/wb_utests/intercon_wb/intercon_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/la_wb/la_wb_tb.v b/verilog/dv/wb_utests/la_wb/la_wb_tb.v
index 293f1fc..3ee98a6 100644
--- a/verilog/dv/wb_utests/la_wb/la_wb_tb.v
+++ b/verilog/dv/wb_utests/la_wb/la_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 `timescale 1 ns / 1 ps
diff --git a/verilog/dv/wb_utests/mem_wb/mem_wb_tb.v b/verilog/dv/wb_utests/mem_wb/mem_wb_tb.v
index d7d7772..44e8190 100644
--- a/verilog/dv/wb_utests/mem_wb/mem_wb_tb.v
+++ b/verilog/dv/wb_utests/mem_wb/mem_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/mprj_ctrl/mprj_ctrl_tb.v b/verilog/dv/wb_utests/mprj_ctrl/mprj_ctrl_tb.v
index 8609ae2..f31dd45 100644
--- a/verilog/dv/wb_utests/mprj_ctrl/mprj_ctrl_tb.v
+++ b/verilog/dv/wb_utests/mprj_ctrl/mprj_ctrl_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/spi_sysctrl_wb/spi_sysctrl_wb_tb.v b/verilog/dv/wb_utests/spi_sysctrl_wb/spi_sysctrl_wb_tb.v
index 3c4d553..e78f723 100644
--- a/verilog/dv/wb_utests/spi_sysctrl_wb/spi_sysctrl_wb_tb.v
+++ b/verilog/dv/wb_utests/spi_sysctrl_wb/spi_sysctrl_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/spimemio_wb/spimemio_wb_tb.v b/verilog/dv/wb_utests/spimemio_wb/spimemio_wb_tb.v
index 3a3a15a..b200db6 100644
--- a/verilog/dv/wb_utests/spimemio_wb/spimemio_wb_tb.v
+++ b/verilog/dv/wb_utests/spimemio_wb/spimemio_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/storage_wb/storage_wb_tb.v b/verilog/dv/wb_utests/storage_wb/storage_wb_tb.v
index ee90a86..7f51648 100644
--- a/verilog/dv/wb_utests/storage_wb/storage_wb_tb.v
+++ b/verilog/dv/wb_utests/storage_wb/storage_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // `define DBG
diff --git a/verilog/dv/wb_utests/sysctrl_wb/sysctrl_wb_tb.v b/verilog/dv/wb_utests/sysctrl_wb/sysctrl_wb_tb.v
index a7ae0d9..95128f3 100644
--- a/verilog/dv/wb_utests/sysctrl_wb/sysctrl_wb_tb.v
+++ b/verilog/dv/wb_utests/sysctrl_wb/sysctrl_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/dv/wb_utests/uart_wb/uart_wb_tb.v b/verilog/dv/wb_utests/uart_wb/uart_wb_tb.v
index debbc74..b95fc20 100644
--- a/verilog/dv/wb_utests/uart_wb/uart_wb_tb.v
+++ b/verilog/dv/wb_utests/uart_wb/uart_wb_tb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 
diff --git a/verilog/gl/DFFRAM.v b/verilog/gl/DFFRAM.v
index bc350da..5db928b 100644
--- a/verilog/gl/DFFRAM.v
+++ b/verilog/gl/DFFRAM.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/caravel.v b/verilog/gl/caravel.v
index c68e423..243ec45 100644
--- a/verilog/gl/caravel.v
+++ b/verilog/gl/caravel.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/chip_io.v b/verilog/gl/chip_io.v
index 9c6bb4a..2caf6b7 100644
--- a/verilog/gl/chip_io.v
+++ b/verilog/gl/chip_io.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/digital_pll.v b/verilog/gl/digital_pll.v
index 001afab..72b7592 100644
--- a/verilog/gl/digital_pll.v
+++ b/verilog/gl/digital_pll.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/gpio_control_block.v b/verilog/gl/gpio_control_block.v
index 7ef8381..66e4737 100644
--- a/verilog/gl/gpio_control_block.v
+++ b/verilog/gl/gpio_control_block.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/mgmt_core.v b/verilog/gl/mgmt_core.v
index 17ce650..833b929 100644
--- a/verilog/gl/mgmt_core.v
+++ b/verilog/gl/mgmt_core.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/mgmt_protect.v b/verilog/gl/mgmt_protect.v
index 40d5357..c7f34da 100644
--- a/verilog/gl/mgmt_protect.v
+++ b/verilog/gl/mgmt_protect.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/mgmt_protect_hv.v b/verilog/gl/mgmt_protect_hv.v
index 68a4634..1c18bf4 100644
--- a/verilog/gl/mgmt_protect_hv.v
+++ b/verilog/gl/mgmt_protect_hv.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/simple_por.v b/verilog/gl/simple_por.v
index ce4133b..082b567 100644
--- a/verilog/gl/simple_por.v
+++ b/verilog/gl/simple_por.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
diff --git a/verilog/gl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v b/verilog/gl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v
index 7dbac90..c070cc6 100644
--- a/verilog/gl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v
+++ b/verilog/gl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/storage.v b/verilog/gl/storage.v
index 5c4fe5f..743a4fc 100644
--- a/verilog/gl/storage.v
+++ b/verilog/gl/storage.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
diff --git a/verilog/gl/user_id_programming.v b/verilog/gl/user_id_programming.v
index 78dbd63..4cdbaf3 100644
--- a/verilog/gl/user_id_programming.v
+++ b/verilog/gl/user_id_programming.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/user_proj_example.v b/verilog/gl/user_proj_example.v
index 8267ec2..7a25bdb 100644
--- a/verilog/gl/user_proj_example.v
+++ b/verilog/gl/user_proj_example.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/gl/user_project_wrapper.v b/verilog/gl/user_project_wrapper.v
index 8fda509..ff8dc73 100644
--- a/verilog/gl/user_project_wrapper.v
+++ b/verilog/gl/user_project_wrapper.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Generated by Yosys 0.9+2406 (git sha1 347dd01, gcc 8.3.1 -fPIC -Os) */
 
diff --git a/verilog/rtl/DFFRAM.v b/verilog/rtl/DFFRAM.v
index 615dfaa..55a03a2 100644
--- a/verilog/rtl/DFFRAM.v
+++ b/verilog/rtl/DFFRAM.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 `ifndef USE_CUSTOM_DFFRAM
diff --git a/verilog/rtl/DFFRAMBB.v b/verilog/rtl/DFFRAMBB.v
index dd2f71d..defb258 100644
--- a/verilog/rtl/DFFRAMBB.v
+++ b/verilog/rtl/DFFRAMBB.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*
diff --git a/verilog/rtl/caravel_clocking.v b/verilog/rtl/caravel_clocking.v
index e187d47..0235f19 100644
--- a/verilog/rtl/caravel_clocking.v
+++ b/verilog/rtl/caravel_clocking.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // This routine synchronizes the 
diff --git a/verilog/rtl/chip_io.v b/verilog/rtl/chip_io.v
index 55b5832..d45af63 100644
--- a/verilog/rtl/chip_io.v
+++ b/verilog/rtl/chip_io.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 // `default_nettype none
 module chip_io(
diff --git a/verilog/rtl/clock_div.v b/verilog/rtl/clock_div.v
index b29ac94..8535243 100644
--- a/verilog/rtl/clock_div.v
+++ b/verilog/rtl/clock_div.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 /* Integer-N clock divider */
 `default_nettype none
diff --git a/verilog/rtl/convert_gpio_sigs.v b/verilog/rtl/convert_gpio_sigs.v
index c9aeefa..b197c7d 100644
--- a/verilog/rtl/convert_gpio_sigs.v
+++ b/verilog/rtl/convert_gpio_sigs.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /* Convert the standard set of GPIO signals: input, output, output_enb,
diff --git a/verilog/rtl/counter_timer_high.v b/verilog/rtl/counter_timer_high.v
index 81c8b0e..235e740 100755
--- a/verilog/rtl/counter_timer_high.v
+++ b/verilog/rtl/counter_timer_high.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /* Simple 32-bit counter-timer for Caravel. */
diff --git a/verilog/rtl/counter_timer_low.v b/verilog/rtl/counter_timer_low.v
index 7dd30bc..074fab4 100755
--- a/verilog/rtl/counter_timer_low.v
+++ b/verilog/rtl/counter_timer_low.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /* Simple 32-bit counter-timer for Caravel. */
diff --git a/verilog/rtl/defines.v b/verilog/rtl/defines.v
index eb99a7b..508ef4e 100644
--- a/verilog/rtl/defines.v
+++ b/verilog/rtl/defines.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // Global parameters
diff --git a/verilog/rtl/digital_pll.v b/verilog/rtl/digital_pll.v
index 395a207..3458349 100644
--- a/verilog/rtl/digital_pll.v
+++ b/verilog/rtl/digital_pll.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // Digital PLL (ring oscillator + controller)
diff --git a/verilog/rtl/digital_pll_controller.v b/verilog/rtl/digital_pll_controller.v
index 8014131..3b745c7 100644
--- a/verilog/rtl/digital_pll_controller.v
+++ b/verilog/rtl/digital_pll_controller.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // (True) digital PLL
diff --git a/verilog/rtl/gpio_control_block.v b/verilog/rtl/gpio_control_block.v
index 109dd9a..f4a92bb 100644
--- a/verilog/rtl/gpio_control_block.v
+++ b/verilog/rtl/gpio_control_block.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /* 
diff --git a/verilog/rtl/gpio_wb.v b/verilog/rtl/gpio_wb.v
index a89464b..bcd4a22 100644
--- a/verilog/rtl/gpio_wb.v
+++ b/verilog/rtl/gpio_wb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module gpio_wb # (
diff --git a/verilog/rtl/housekeeping_spi.v b/verilog/rtl/housekeeping_spi.v
index 73a579a..c4bb78e 100644
--- a/verilog/rtl/housekeeping_spi.v
+++ b/verilog/rtl/housekeeping_spi.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 //-------------------------------------
diff --git a/verilog/rtl/la_wb.v b/verilog/rtl/la_wb.v
index 1d9910d..cec862f 100644
--- a/verilog/rtl/la_wb.v
+++ b/verilog/rtl/la_wb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module la_wb # (
diff --git a/verilog/rtl/mem_wb.v b/verilog/rtl/mem_wb.v
index 23c7b22..10fe839 100644
--- a/verilog/rtl/mem_wb.v
+++ b/verilog/rtl/mem_wb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module mem_wb (
diff --git a/verilog/rtl/mgmt_core.v b/verilog/rtl/mgmt_core.v
index b706079..f88155c 100644
--- a/verilog/rtl/mgmt_core.v
+++ b/verilog/rtl/mgmt_core.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module mgmt_core (
diff --git a/verilog/rtl/mgmt_protect.v b/verilog/rtl/mgmt_protect.v
index 2e03158..306de34 100644
--- a/verilog/rtl/mgmt_protect.v
+++ b/verilog/rtl/mgmt_protect.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*----------------------------------------------------------------------*/
diff --git a/verilog/rtl/mgmt_protect_hv.v b/verilog/rtl/mgmt_protect_hv.v
index f2ea418..99e4baf 100644
--- a/verilog/rtl/mgmt_protect_hv.v
+++ b/verilog/rtl/mgmt_protect_hv.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*----------------------------------------------------------------------*/
diff --git a/verilog/rtl/mprj_ctrl.v b/verilog/rtl/mprj_ctrl.v
index b7f02da..c9648ab 100644
--- a/verilog/rtl/mprj_ctrl.v
+++ b/verilog/rtl/mprj_ctrl.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module mprj_ctrl_wb #(
diff --git a/verilog/rtl/mprj_io.v b/verilog/rtl/mprj_io.v
index 34fb303..16a49a7 100644
--- a/verilog/rtl/mprj_io.v
+++ b/verilog/rtl/mprj_io.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 // `default_nettype none
 module mprj_io #(
diff --git a/verilog/rtl/pads.v b/verilog/rtl/pads.v
index 25bc89f..6813066 100644
--- a/verilog/rtl/pads.v
+++ b/verilog/rtl/pads.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 // `default_nettype none
 `ifndef TOP_ROUTING 
diff --git a/verilog/rtl/ring_osc2x13.v b/verilog/rtl/ring_osc2x13.v
index c371e34..a96167f 100644
--- a/verilog/rtl/ring_osc2x13.v
+++ b/verilog/rtl/ring_osc2x13.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // Tunable ring oscillator---synthesizable (physical) version.
diff --git a/verilog/rtl/simple_por.v b/verilog/rtl/simple_por.v
index faf7ffb..04bbafe 100644
--- a/verilog/rtl/simple_por.v
+++ b/verilog/rtl/simple_por.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 `timescale 1 ns / 1 ps
diff --git a/verilog/rtl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v b/verilog/rtl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v
index 71ee6b5..1ec81ef 100644
--- a/verilog/rtl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v
+++ b/verilog/rtl/sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 module sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped (
 	X    ,
diff --git a/verilog/rtl/sram_1rw1r_32_256_8_sky130.v b/verilog/rtl/sram_1rw1r_32_256_8_sky130.v
index 86985ec..5840f13 100644
--- a/verilog/rtl/sram_1rw1r_32_256_8_sky130.v
+++ b/verilog/rtl/sram_1rw1r_32_256_8_sky130.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // OpenRAM SRAM model
diff --git a/verilog/rtl/storage.v b/verilog/rtl/storage.v
index e671cc5..b519e0d 100644
--- a/verilog/rtl/storage.v
+++ b/verilog/rtl/storage.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
  
diff --git a/verilog/rtl/storage_bridge_wb.v b/verilog/rtl/storage_bridge_wb.v
index 3e46251..23c81e2 100644
--- a/verilog/rtl/storage_bridge_wb.v
+++ b/verilog/rtl/storage_bridge_wb.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module storage_bridge_wb (
diff --git a/verilog/rtl/sysctrl.v b/verilog/rtl/sysctrl.v
index 93f2dcb..8a694aa 100644
--- a/verilog/rtl/sysctrl.v
+++ b/verilog/rtl/sysctrl.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module sysctrl_wb #(
diff --git a/verilog/rtl/user_id_programming.v b/verilog/rtl/user_id_programming.v
index f25d08f..41fd248 100644
--- a/verilog/rtl/user_id_programming.v
+++ b/verilog/rtl/user_id_programming.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 // This module represents an unprogrammed mask revision
diff --git a/verilog/rtl/user_proj_example.v b/verilog/rtl/user_proj_example.v
index be1cadb..ec99e66 100644
--- a/verilog/rtl/user_proj_example.v
+++ b/verilog/rtl/user_proj_example.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*
diff --git a/verilog/rtl/user_project_wrapper.v b/verilog/rtl/user_project_wrapper.v
index 6ea1eef..2e5b525 100644
--- a/verilog/rtl/user_project_wrapper.v
+++ b/verilog/rtl/user_project_wrapper.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 /*
diff --git a/verilog/rtl/wb_intercon.v b/verilog/rtl/wb_intercon.v
index e0c7358..e008406 100644
--- a/verilog/rtl/wb_intercon.v
+++ b/verilog/rtl/wb_intercon.v
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 `default_nettype none
 module wb_intercon #(