diff --git a/dev/opentitan.nix b/dev/opentitan.nix
index ff26a50..574b445 100644
--- a/dev/opentitan.nix
+++ b/dev/opentitan.nix
@@ -1,3 +1,6 @@
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   pkgs,
   ncurses5-fhs,
diff --git a/pkgs/bazel_ot/default.nix b/pkgs/bazel_ot/default.nix
index f7ea11b..9deb3af 100644
--- a/pkgs/bazel_ot/default.nix
+++ b/pkgs/bazel_ot/default.nix
@@ -1,3 +1,6 @@
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   runCommand,
   bazelisk,
diff --git a/pkgs/ibex-cosim.nix b/pkgs/ibex-cosim.nix
index 06ce11f..41d7861 100644
--- a/pkgs/ibex-cosim.nix
+++ b/pkgs/ibex-cosim.nix
@@ -1,3 +1,6 @@
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   fetchFromGitHub,
   stdenv,
diff --git a/pkgs/llvm_cheriot.nix b/pkgs/llvm_cheriot.nix
index 3c4ccc0..11e0a07 100644
--- a/pkgs/llvm_cheriot.nix
+++ b/pkgs/llvm_cheriot.nix
@@ -1,6 +1,6 @@
-# Copyright lowRISC contributors.
-# Licensed under the Apache License, Version 2.0, see LICENSE for details.
-# SPDX-License-Identifier: Apache-2.0
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   stdenv,
   fetchFromGitHub,
diff --git a/pkgs/lowrisc-toolchain-gcc-rv32imcb.nix b/pkgs/lowrisc-toolchain-gcc-rv32imcb.nix
index f469aaa..5fdc550 100644
--- a/pkgs/lowrisc-toolchain-gcc-rv32imcb.nix
+++ b/pkgs/lowrisc-toolchain-gcc-rv32imcb.nix
@@ -1,3 +1,6 @@
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   fetchzip,
   stdenv,
diff --git a/pkgs/lowrisc-toolchain-gcc-rv64imac.nix b/pkgs/lowrisc-toolchain-gcc-rv64imac.nix
index 7e61de2..376aa51 100644
--- a/pkgs/lowrisc-toolchain-gcc-rv64imac.nix
+++ b/pkgs/lowrisc-toolchain-gcc-rv64imac.nix
@@ -1,3 +1,6 @@
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   fetchzip,
   stdenv,
diff --git a/pkgs/ncurses5-fhs.nix b/pkgs/ncurses5-fhs.nix
index 5f0c4ad..ad49b45 100644
--- a/pkgs/ncurses5-fhs.nix
+++ b/pkgs/ncurses5-fhs.nix
@@ -1,3 +1,6 @@
+# Copyright lowRISC Contributors.
+# Licensed under the MIT License, see LICENSE for details.
+# SPDX-License-Identifier: MIT
 {
   runCommand,
   ncurses5,