diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d5615e4..4768afe 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,7 +12,7 @@
 
 All software (code, associated documentation, support files, etc) in the
 Yosys SymbiFlow Plugins repository are licensed under the very permissive
-[ISC Licence](COPYING). A copy can be found in the [`COPYING`](COPYING) file.
+[Apache-2.0](LICENS). A copy can be found in the [`LICENSE`](LICENSE) file.
 
 All new contributions must also be released under this license.
 
diff --git a/LICENSE b/LICENSE
index d672eaf..d645695 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,13 +1,202 @@
-Copyright (C) 2020  SymbiFlow Project Authors.
 
-Permission to use, copy, modify, and/or distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
 
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      direction or management of such entity, whether by contract or
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+
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+      "Work" shall mean the work of authorship, whether in Source or
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+      "Contribution" shall mean any work of authorship, including
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+          notices within Derivative Works that You distribute, alongside
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.
diff --git a/setup.py b/setup.py
index c74a010..5dd5177 100644
--- a/setup.py
+++ b/setup.py
@@ -1,13 +1,21 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020  The SymbiFlow Authors.
+# Copyright 2020-2022 F4PGA Authors
 #
-# Use of this source code is governed by a ISC-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/ISC
+# 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
 #
-# SPDX-License-Identifier:  ISC
+#     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
 
 import setuptools
 
@@ -31,7 +39,7 @@
     include_package_data=True,
     classifiers=[
         "Programming Language :: Python :: 3",
-        "License :: OSI Approved :: ISC License",
+        "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
     ],
 )
diff --git a/tests/test_converting.py b/tests/test_converting.py
index 37d9a1f..e3fef94 100644
--- a/tests/test_converting.py
+++ b/tests/test_converting.py
@@ -1,13 +1,21 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020  The SymbiFlow Authors.
+# Copyright 2020-2022 F4PGA Authors
 #
-# Use of this source code is governed by a ISC-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/ISC
+# 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
 #
-# SPDX-License-Identifier:  ISC
+#     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
 
 import pytest
 from vtr_xml_utils import convert
diff --git a/vtr_xml_utils/__init__.py b/vtr_xml_utils/__init__.py
index 88e69cf..b2b4362 100644
--- a/vtr_xml_utils/__init__.py
+++ b/vtr_xml_utils/__init__.py
@@ -1,10 +1,18 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020  The SymbiFlow Authors.
+# Copyright 2020-2022 F4PGA Authors
 #
-# Use of this source code is governed by a ISC-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/ISC
+# 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
 #
-# SPDX-License-Identifier:  ISC
+#     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
diff --git a/vtr_xml_utils/__main__.py b/vtr_xml_utils/__main__.py
index dce03a5..6dbccc2 100644
--- a/vtr_xml_utils/__main__.py
+++ b/vtr_xml_utils/__main__.py
@@ -1,13 +1,21 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020  The SymbiFlow Authors.
+# Copyright 2020-2022 F4PGA Authors
 #
-# Use of this source code is governed by a ISC-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/ISC
+# 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
 #
-# SPDX-License-Identifier:  ISC
+#     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
 
 from . import convert
 
diff --git a/vtr_xml_utils/convert.py b/vtr_xml_utils/convert.py
index 73e5fb8..ef1045d 100644
--- a/vtr_xml_utils/convert.py
+++ b/vtr_xml_utils/convert.py
@@ -1,13 +1,21 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020  The SymbiFlow Authors.
+# Copyright 2020-2022 F4PGA Authors
 #
-# Use of this source code is governed by a ISC-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/ISC
+# 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
 #
-# SPDX-License-Identifier:  ISC
+#     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
 
 import lxml.etree as ET
 import pkg_resources
diff --git a/vtr_xml_utils/resources/attribute-fixes.xsl b/vtr_xml_utils/resources/attribute-fixes.xsl
index ed10b16..499e8f4 100644
--- a/vtr_xml_utils/resources/attribute-fixes.xsl
+++ b/vtr_xml_utils/resources/attribute-fixes.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 
diff --git a/vtr_xml_utils/resources/convert-pb_type-attributes.xsl b/vtr_xml_utils/resources/convert-pb_type-attributes.xsl
index 2482afe..751c5a3 100644
--- a/vtr_xml_utils/resources/convert-pb_type-attributes.xsl
+++ b/vtr_xml_utils/resources/convert-pb_type-attributes.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 
diff --git a/vtr_xml_utils/resources/convert-port-tag.xsl b/vtr_xml_utils/resources/convert-port-tag.xsl
index c9c8e01..7524a7c 100644
--- a/vtr_xml_utils/resources/convert-port-tag.xsl
+++ b/vtr_xml_utils/resources/convert-port-tag.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 
diff --git a/vtr_xml_utils/resources/convert-prefix-port.xsl b/vtr_xml_utils/resources/convert-prefix-port.xsl
index 76a9c9e..d55fe6f 100644
--- a/vtr_xml_utils/resources/convert-prefix-port.xsl
+++ b/vtr_xml_utils/resources/convert-prefix-port.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 
diff --git a/vtr_xml_utils/resources/fpga_architecture.xsd b/vtr_xml_utils/resources/fpga_architecture.xsd
index efd964a..cce649f 100644
--- a/vtr_xml_utils/resources/fpga_architecture.xsd
+++ b/vtr_xml_utils/resources/fpga_architecture.xsd
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 
 
  XML 1.0 Schema for the FPGA architecture description structure developed based on documentation here:
diff --git a/vtr_xml_utils/resources/identity.xsl b/vtr_xml_utils/resources/identity.xsl
index 67de266..d828e46 100644
--- a/vtr_xml_utils/resources/identity.xsl
+++ b/vtr_xml_utils/resources/identity.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output method="xml" indent="yes"/>
diff --git a/vtr_xml_utils/resources/pack-patterns.xsl b/vtr_xml_utils/resources/pack-patterns.xsl
index eb07d79..e4ae3a5 100644
--- a/vtr_xml_utils/resources/pack-patterns.xsl
+++ b/vtr_xml_utils/resources/pack-patterns.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 
diff --git a/vtr_xml_utils/resources/packed_netlist.xsd b/vtr_xml_utils/resources/packed_netlist.xsd
index 355f7b7..a21e571 100644
--- a/vtr_xml_utils/resources/packed_netlist.xsd
+++ b/vtr_xml_utils/resources/packed_netlist.xsd
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 
 
  XML 1.0 Schema for packed netlist format developed based on documentation here:
diff --git a/vtr_xml_utils/resources/remove-duplicate-models.xsl b/vtr_xml_utils/resources/remove-duplicate-models.xsl
index 07f65d7..88ae5af 100644
--- a/vtr_xml_utils/resources/remove-duplicate-models.xsl
+++ b/vtr_xml_utils/resources/remove-duplicate-models.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 
diff --git a/vtr_xml_utils/resources/routing_resource.xsd b/vtr_xml_utils/resources/routing_resource.xsd
index 555e1f7..a5df738 100644
--- a/vtr_xml_utils/resources/routing_resource.xsd
+++ b/vtr_xml_utils/resources/routing_resource.xsd
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 
 
  XML 1.0 Schema for rr_graph structure developed based on documentation here:
diff --git a/vtr_xml_utils/resources/sort-tags.xsl b/vtr_xml_utils/resources/sort-tags.xsl
index 6f60b69..f2ed84b 100644
--- a/vtr_xml_utils/resources/sort-tags.xsl
+++ b/vtr_xml_utils/resources/sort-tags.xsl
@@ -1,12 +1,20 @@
 <?xml version="1.0"?>
 <!-- 
- Copyright (C) 2020  The SymbiFlow Authors.
+ Copyright 2020-2022 F4PGA Authors
 
- Use of this source code is governed by a ISC-style
- license that can be found in the LICENSE file or at
- https://opensource.org/licenses/ISC
+ 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
 
- SPDX-License-Identifier:   ISC
+     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
 -->
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">