diff --git a/crypto/aescbc/aes_cbc.go b/crypto/aescbc/aes_cbc.go
index f1fdc84d..d69a5f49 100644
--- a/crypto/aescbc/aes_cbc.go
+++ b/crypto/aescbc/aes_cbc.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package aescbc
 
 import (
diff --git a/crypto/aescbc/aes_cbc_test.go b/crypto/aescbc/aes_cbc_test.go
index 06dcee0d..bb03f706 100644
--- a/crypto/aescbc/aes_cbc_test.go
+++ b/crypto/aescbc/aes_cbc_test.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package aescbc_test
 
 import (
diff --git a/crypto/aescbc/errors.go b/crypto/aescbc/errors.go
index 542c3450..f3d2d7ce 100644
--- a/crypto/aescbc/errors.go
+++ b/crypto/aescbc/errors.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package aescbc
 
 import "errors"
diff --git a/crypto/backup/encryptedsessiondata.go b/crypto/backup/encryptedsessiondata.go
index 8ac74151..37b0a6c8 100644
--- a/crypto/backup/encryptedsessiondata.go
+++ b/crypto/backup/encryptedsessiondata.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package backup
 
 import (
diff --git a/crypto/backup/encryptedsessiondata_test.go b/crypto/backup/encryptedsessiondata_test.go
index 8aab1390..761c4328 100644
--- a/crypto/backup/encryptedsessiondata_test.go
+++ b/crypto/backup/encryptedsessiondata_test.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package backup_test
 
 import (
diff --git a/crypto/backup/ephemeralkey.go b/crypto/backup/ephemeralkey.go
index d0ee03a6..e481e7a9 100644
--- a/crypto/backup/ephemeralkey.go
+++ b/crypto/backup/ephemeralkey.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package backup
 
 import (
diff --git a/crypto/backup/ephemeralkey_test.go b/crypto/backup/ephemeralkey_test.go
index 93d24563..0842f54f 100644
--- a/crypto/backup/ephemeralkey_test.go
+++ b/crypto/backup/ephemeralkey_test.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package backup_test
 
 import (
diff --git a/crypto/backup/megolmbackup.go b/crypto/backup/megolmbackup.go
index dea3e704..0a2a42a2 100644
--- a/crypto/backup/megolmbackup.go
+++ b/crypto/backup/megolmbackup.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package backup
 
 import (
diff --git a/crypto/backup/megolmbackupkey.go b/crypto/backup/megolmbackupkey.go
index 8a57b4cf..8f23d104 100644
--- a/crypto/backup/megolmbackupkey.go
+++ b/crypto/backup/megolmbackupkey.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package backup
 
 import (
diff --git a/crypto/pkcs7/pkcs7.go b/crypto/pkcs7/pkcs7.go
index 1018e52b..c83c5afd 100644
--- a/crypto/pkcs7/pkcs7.go
+++ b/crypto/pkcs7/pkcs7.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package pkcs7
 
 import "bytes"
diff --git a/crypto/pkcs7/pkcs7_test.go b/crypto/pkcs7/pkcs7_test.go
index 6ef835c0..5edc9a92 100644
--- a/crypto/pkcs7/pkcs7_test.go
+++ b/crypto/pkcs7/pkcs7_test.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package pkcs7_test
 
 import (
diff --git a/crypto/signatures/signatures.go b/crypto/signatures/signatures.go
index 7ad19316..0c4422f9 100644
--- a/crypto/signatures/signatures.go
+++ b/crypto/signatures/signatures.go
@@ -1,3 +1,9 @@
+// Copyright (c) 2024 Sumner Evans
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package signatures
 
 import (