diff --git a/hdl/chisel/BUILD b/hdl/chisel/BUILD
index 54ab095..11c0dcd 100644
--- a/hdl/chisel/BUILD
+++ b/hdl/chisel/BUILD
@@ -1,4 +1,17 @@
 # Copyright 2023 Google 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.
+
 load("@kelvin_hw//rules:chisel.bzl", "chisel_cc_library", "chisel_library")
 
 chisel_library(
diff --git a/hdl/chisel/src/common/Fifo.scala b/hdl/chisel/src/common/Fifo.scala
index 3880abf..155266f 100644
--- a/hdl/chisel/src/common/Fifo.scala
+++ b/hdl/chisel/src/common/Fifo.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/common/Fifo4.scala b/hdl/chisel/src/common/Fifo4.scala
index c7546f8..0c277a1 100644
--- a/hdl/chisel/src/common/Fifo4.scala
+++ b/hdl/chisel/src/common/Fifo4.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/common/Fifo4e.scala b/hdl/chisel/src/common/Fifo4e.scala
index 5376b01..ac2a484 100644
--- a/hdl/chisel/src/common/Fifo4e.scala
+++ b/hdl/chisel/src/common/Fifo4e.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/common/Fifo4x4.scala b/hdl/chisel/src/common/Fifo4x4.scala
index 8ac0aa0..656d2c6 100644
--- a/hdl/chisel/src/common/Fifo4x4.scala
+++ b/hdl/chisel/src/common/Fifo4x4.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/common/IDiv.scala b/hdl/chisel/src/common/IDiv.scala
index 30cf5f9..aa2e660 100644
--- a/hdl/chisel/src/common/IDiv.scala
+++ b/hdl/chisel/src/common/IDiv.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/common/Library.scala b/hdl/chisel/src/common/Library.scala
index 6fed730..f3ab5aa 100644
--- a/hdl/chisel/src/common/Library.scala
+++ b/hdl/chisel/src/common/Library.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/common/Slice.scala b/hdl/chisel/src/common/Slice.scala
index b4836f9..5895e52 100644
--- a/hdl/chisel/src/common/Slice.scala
+++ b/hdl/chisel/src/common/Slice.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package common
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/Axi.scala b/hdl/chisel/src/kelvin/Axi.scala
index 98d7422..95016f9 100644
--- a/hdl/chisel/src/kelvin/Axi.scala
+++ b/hdl/chisel/src/kelvin/Axi.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/ClockGate.scala b/hdl/chisel/src/kelvin/ClockGate.scala
index 6d9d00a..d66a7b0 100644
--- a/hdl/chisel/src/kelvin/ClockGate.scala
+++ b/hdl/chisel/src/kelvin/ClockGate.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/Core.scala b/hdl/chisel/src/kelvin/Core.scala
index 5358758..2c72f9c 100644
--- a/hdl/chisel/src/kelvin/Core.scala
+++ b/hdl/chisel/src/kelvin/Core.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/DBus2Axi.scala b/hdl/chisel/src/kelvin/DBus2Axi.scala
index f765870..68aba80 100644
--- a/hdl/chisel/src/kelvin/DBus2Axi.scala
+++ b/hdl/chisel/src/kelvin/DBus2Axi.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/DBusMux.scala b/hdl/chisel/src/kelvin/DBusMux.scala
index b62f594..8c9c566 100644
--- a/hdl/chisel/src/kelvin/DBusMux.scala
+++ b/hdl/chisel/src/kelvin/DBusMux.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/L1DCache.scala b/hdl/chisel/src/kelvin/L1DCache.scala
index 3650ef8..13e61a1 100644
--- a/hdl/chisel/src/kelvin/L1DCache.scala
+++ b/hdl/chisel/src/kelvin/L1DCache.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/L1ICache.scala b/hdl/chisel/src/kelvin/L1ICache.scala
index d7d4e21..55cc19c 100644
--- a/hdl/chisel/src/kelvin/L1ICache.scala
+++ b/hdl/chisel/src/kelvin/L1ICache.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/Library.scala b/hdl/chisel/src/kelvin/Library.scala
index d9e3b75..cb887c2 100644
--- a/hdl/chisel/src/kelvin/Library.scala
+++ b/hdl/chisel/src/kelvin/Library.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/Parameters.scala b/hdl/chisel/src/kelvin/Parameters.scala
index 7b14f19..b9e3d77 100644
--- a/hdl/chisel/src/kelvin/Parameters.scala
+++ b/hdl/chisel/src/kelvin/Parameters.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Alu.scala b/hdl/chisel/src/kelvin/scalar/Alu.scala
index 3ce227d..445dacc 100644
--- a/hdl/chisel/src/kelvin/scalar/Alu.scala
+++ b/hdl/chisel/src/kelvin/scalar/Alu.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Bru.scala b/hdl/chisel/src/kelvin/scalar/Bru.scala
index c6da8d1..a83d157 100644
--- a/hdl/chisel/src/kelvin/scalar/Bru.scala
+++ b/hdl/chisel/src/kelvin/scalar/Bru.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Csr.scala b/hdl/chisel/src/kelvin/scalar/Csr.scala
index 60b6ac6..8ff2bb5 100644
--- a/hdl/chisel/src/kelvin/scalar/Csr.scala
+++ b/hdl/chisel/src/kelvin/scalar/Csr.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Debug.scala b/hdl/chisel/src/kelvin/scalar/Debug.scala
index e626266..4181680 100644
--- a/hdl/chisel/src/kelvin/scalar/Debug.scala
+++ b/hdl/chisel/src/kelvin/scalar/Debug.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Decode.scala b/hdl/chisel/src/kelvin/scalar/Decode.scala
index 646b22c..48f3622 100644
--- a/hdl/chisel/src/kelvin/scalar/Decode.scala
+++ b/hdl/chisel/src/kelvin/scalar/Decode.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Dvu.scala b/hdl/chisel/src/kelvin/scalar/Dvu.scala
index 1e73146..caddba7 100644
--- a/hdl/chisel/src/kelvin/scalar/Dvu.scala
+++ b/hdl/chisel/src/kelvin/scalar/Dvu.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Fetch.scala b/hdl/chisel/src/kelvin/scalar/Fetch.scala
index 5771e5f..722c428 100644
--- a/hdl/chisel/src/kelvin/scalar/Fetch.scala
+++ b/hdl/chisel/src/kelvin/scalar/Fetch.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Flush.scala b/hdl/chisel/src/kelvin/scalar/Flush.scala
index 65eeb11..0766ee0 100644
--- a/hdl/chisel/src/kelvin/scalar/Flush.scala
+++ b/hdl/chisel/src/kelvin/scalar/Flush.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Lsu.scala b/hdl/chisel/src/kelvin/scalar/Lsu.scala
index 9a5ce8e..92b8628 100644
--- a/hdl/chisel/src/kelvin/scalar/Lsu.scala
+++ b/hdl/chisel/src/kelvin/scalar/Lsu.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Mlu.scala b/hdl/chisel/src/kelvin/scalar/Mlu.scala
index d302c88..6826bc6 100644
--- a/hdl/chisel/src/kelvin/scalar/Mlu.scala
+++ b/hdl/chisel/src/kelvin/scalar/Mlu.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/Regfile.scala b/hdl/chisel/src/kelvin/scalar/Regfile.scala
index 2b554b0..c594fcb 100644
--- a/hdl/chisel/src/kelvin/scalar/Regfile.scala
+++ b/hdl/chisel/src/kelvin/scalar/Regfile.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/SCore.scala b/hdl/chisel/src/kelvin/scalar/SCore.scala
index dcc5248..07ef6ad 100644
--- a/hdl/chisel/src/kelvin/scalar/SCore.scala
+++ b/hdl/chisel/src/kelvin/scalar/SCore.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/kelvin/scalar/SLog.scala b/hdl/chisel/src/kelvin/scalar/SLog.scala
index 3c3eca6..b756821 100644
--- a/hdl/chisel/src/kelvin/scalar/SLog.scala
+++ b/hdl/chisel/src/kelvin/scalar/SLog.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package kelvin
 
 import chisel3._
diff --git a/hdl/chisel/src/matcha/Axi2Sram.scala b/hdl/chisel/src/matcha/Axi2Sram.scala
index 5308d86..9926b7b 100644
--- a/hdl/chisel/src/matcha/Axi2Sram.scala
+++ b/hdl/chisel/src/matcha/Axi2Sram.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package matcha
 
 import chisel3._
diff --git a/hdl/chisel/src/matcha/Crossbar.scala b/hdl/chisel/src/matcha/Crossbar.scala
index 82ca9f7..93a213b 100644
--- a/hdl/chisel/src/matcha/Crossbar.scala
+++ b/hdl/chisel/src/matcha/Crossbar.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package matcha
 
 import chisel3._
diff --git a/hdl/chisel/src/matcha/Kelvin.scala b/hdl/chisel/src/matcha/Kelvin.scala
index e80b1a1..091aadb 100644
--- a/hdl/chisel/src/matcha/Kelvin.scala
+++ b/hdl/chisel/src/matcha/Kelvin.scala
@@ -1,4 +1,17 @@
 // Copyright 2023 Google 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.
+
 package matcha
 
 import chisel3._
diff --git a/tests/verilator_sim/BUILD b/tests/verilator_sim/BUILD
index 39e150f..c47127e 100644
--- a/tests/verilator_sim/BUILD
+++ b/tests/verilator_sim/BUILD
@@ -1,4 +1,16 @@
 # Copyright 2023 Google 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.
 
 cc_library(
     name = "sim_libs",