diff --git a/openlane/user_project_wrapper/gen_pdn.tcl b/openlane/user_project_wrapper/gen_pdn.tcl
index 74d61c4..94bd008 100644
--- a/openlane/user_project_wrapper/gen_pdn.tcl
+++ b/openlane/user_project_wrapper/gen_pdn.tcl
@@ -1,3 +1,19 @@
+# SPDX-FileCopyrightText: 2020 Efabless Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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
+
+
 read_lef $::env(MERGED_LEF_UNPADDED)
 read_def $::env(CURRENT_DEF)
 
diff --git a/openlane/user_project_wrapper/interactive.tcl b/openlane/user_project_wrapper/interactive.tcl
index 738387c..f93818b 100644
--- a/openlane/user_project_wrapper/interactive.tcl
+++ b/openlane/user_project_wrapper/interactive.tcl
@@ -1,4 +1,5 @@
 #!/usr/bin/tclsh
+# SPDX-FileCopyrightText: 2020 Efabless Corporation
 # Copyright 2020 Efabless Corporation
 # Copyright 2020 Sylvain Munaut
 #
@@ -13,6 +14,7 @@
 # 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
 
 
 package require openlane;
diff --git a/openlane/user_project_wrapper/pdn.tcl b/openlane/user_project_wrapper/pdn.tcl
index d9bab11..212085c 100644
--- a/openlane/user_project_wrapper/pdn.tcl
+++ b/openlane/user_project_wrapper/pdn.tcl
@@ -1,3 +1,18 @@
+# SPDX-FileCopyrightText: 2020 Efabless Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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
+
 # Power nets
 set ::power_nets $::env(_VDD_NET_NAME)
 set ::ground_nets $::env(_GND_NET_NAME)
diff --git a/verilog/dv/model/i2c_slave_model.v b/verilog/dv/model/i2c_slave_model.v
index 1271127..83b8f8b 100755
--- a/verilog/dv/model/i2c_slave_model.v
+++ b/verilog/dv/model/i2c_slave_model.v
@@ -1,3 +1,20 @@
+//////////////////////////////////////////////////////////////////////////////
+// SPDX-FileCopyrightText: 2021 , Richard Herveille
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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
+// SPDX-FileContributor: Created by Dinesh Annayya <dinesha@opencores.org>
+//
 /////////////////////////////////////////////////////////////////////
 ////                                                             ////
 ////  WISHBONE rev.B2 compliant synthesizable I2C Slave model    ////
diff --git a/verilog/dv/model/mt48lc8m8a2.v b/verilog/dv/model/mt48lc8m8a2.v
index add1c36..0906d4d 100755
--- a/verilog/dv/model/mt48lc8m8a2.v
+++ b/verilog/dv/model/mt48lc8m8a2.v
@@ -1,3 +1,21 @@
+//////////////////////////////////////////////////////////////////////////////
+// SPDX-FileCopyrightText: 2012 Micron Technology, Inc.
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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
+// SPDX-FileContributor: Created by Dinesh Annayya <dinesha@opencores.org>
+//
+
 /****************************************************************************************
 *
 *    File Name:  MT48LC8M8A2.V  
diff --git a/verilog/dv/model/s25fl256s.sv b/verilog/dv/model/s25fl256s.sv
index 7883af3..9e230cf 100644
--- a/verilog/dv/model/s25fl256s.sv
+++ b/verilog/dv/model/s25fl256s.sv
@@ -1,3 +1,20 @@
+//////////////////////////////////////////////////////////////////////////////
+// SPDX-FileCopyrightText: 2012 Spansion, LLC.
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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
+// SPDX-FileContributor: Created by Dinesh Annayya <dinesha@opencores.org>
+//
 ///////////////////////////////////////////////////////////////////////////////
 //  File name : s25fl256s.v
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/verilog/dv/wb_port/run_verilog b/verilog/dv/wb_port/run_verilog
index c28480e..5ffed3c 100644
--- a/verilog/dv/wb_port/run_verilog
+++ b/verilog/dv/wb_port/run_verilog
@@ -1,2 +1,20 @@
+# //////////////////////////////////////////////////////////////////////////////
+# // SPDX-FileCopyrightText: 2021, Dinesh Annayya
+# // 
+# // Licensed under the Apache License, Version 2.0 (the "License");
+# // you may not use this file except in compliance with the License.
+# // You may obtain a copy of the License at
+# //
+# //      http://www.apache.org/licenses/LICENSE-2.0
+# //
+# // Unless required by applicable law or agreed to in writing, software
+# // distributed under the License is distributed on an "AS IS" BASIS,
+# // 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
+# // SPDX-FileContributor: Dinesh Annayya <dinesha@opencores.org>
+# // //////////////////////////////////////////////////////////////////////////
+
 #iverilog -g2005-sv -DFUNCTIONAL -DSIM -DGL -I /home/dinesha/workarea/pdk/sky130A -I /home/dinesha/workarea/opencore/git/yifive_r0/caravel/verilog/dv/caravel -I /home/dinesha/workarea/opencore/git/yifive_r0/caravel/verilog/rtl -I /home/dinesha/workarea/opencore/git/yifive_r0/caravel/verilog -I ../ -I../../../verilog/rtl -I../../../verilog/gl  -I ../../../verilog wb_port_tb.v -o wb_port.vvp
 iverilog -g2005-sv -DWFDUMP -DFUNCTIONAL -DSIM -DGL -I /home/dinesha/workarea/pdk/sky130A -I /home/dinesha/workarea/opencore/git/yifive_r0/caravel/verilog/dv/caravel -I /home/dinesha/workarea/opencore/git/yifive_r0/caravel/verilog/rtl -I /home/dinesha/workarea/opencore/git/yifive_r0/caravel/verilog -I ../ -I../../../verilog/rtl -I../../../verilog/gl  -I ../../../verilog wb_port_tb.v -o wb_port.vvp
diff --git a/verilog/rtl/i2cm/src/includes/i2cm_defines.v b/verilog/rtl/i2cm/src/includes/i2cm_defines.v
index dd2ba88..ccfee25 100755
--- a/verilog/rtl/i2cm/src/includes/i2cm_defines.v
+++ b/verilog/rtl/i2cm/src/includes/i2cm_defines.v
@@ -1,4 +1,20 @@
-
+//////////////////////////////////////////////////////////////////////////////
+// SPDX-FileCopyrightText: 2021 , Dinesh Annayya                          
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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
+// SPDX-FileContributor: Created by Dinesh Annayya <dinesha@opencores.org>
+//
 // I2C registers wishbone addresses
 
 // bitcontroller states