diff --git a/internal/era2/accumulator.go b/internal/era2/accumulator.go
index da75e7dceb..732931fa96 100644
--- a/internal/era2/accumulator.go
+++ b/internal/era2/accumulator.go
@@ -1,4 +1,4 @@
-// Copyright 2024 The go-ethereum Authors
+// Copyright 2025 The go-ethereum Authors
 // This file is part of the go-ethereum library.
 //
 // The go-ethereum library is free software: you can redistribute it and/or modify
diff --git a/internal/era2/builder.go b/internal/era2/builder.go
index a291174121..79370e4336 100644
--- a/internal/era2/builder.go
+++ b/internal/era2/builder.go
@@ -1,7 +1,22 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
 package era2
 
 // The format can be summarized with the following expression:
-
 //    eraE := Version | CompressedHeader* | CompressedBody* | CompressedReceipts* | TotalDifficulty* | Proofs* | other-entries* | Accumulator | BlockIndex
 // Each basic element is its own e2store entry:
 
diff --git a/internal/era2/era.go b/internal/era2/era.go
index 85e711b5a1..ac965254fc 100644
--- a/internal/era2/era.go
+++ b/internal/era2/era.go
@@ -1,3 +1,19 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
 package era2
 
 import (
diff --git a/internal/era2/era_test.go b/internal/era2/era_test.go
index 1dfdb3f6a5..447c7676ff 100644
--- a/internal/era2/era_test.go
+++ b/internal/era2/era_test.go
@@ -1,4 +1,4 @@
-// Copyright 2024 The go-ethereum Authors
+// Copyright 2025 The go-ethereum Authors
 // This file is part of the go-ethereum library.
 //
 // The go-ethereum library is free software: you can redistribute it and/or modify