version.h is tiny, but the other two certainly deserve a license header.
<!DOCTYPE html>
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<html>
<head>
<title>Journal</title>
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
#include "openssl-util.h"
#include "alloc-util.h"
-/* Detailed project version that includes git commit when not built from a release.
+/* SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Detailed project version that includes git commit when not built from a release.
* Use this in preference to PROJECT_VERSION, with the following exceptions:
* - where a simplified form is expected for compatibility, for example
* 'udevadm version',