diff --git a/filter.sh b/filter.sh
new file mode 100755
index 0000000..8189afb
--- /dev/null
+++ b/filter.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-3.0-or-later
+set -euo pipefail
+export FILTER_BRANCH_SQUELCH_WARNING=1
+git branch -D filtered
+git switch -c filtered
+git filter-branch -f --tree-filter "rm -f $(rg --files-without-match 'SPDX-License-Identifier: (L)?GPL-3.0-or-later' -g '/u??/**/*' | tr '\n' ' ')" HEAD
+git push -f -u filtered filtered
+git switch -