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+<!-- SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com> -->
+<!-- SPDX-License-Identifier: LGPL-3.0-or-later -->
+
+# Progmasoft Patent Grant
+
+Project-owned software in this repository is covered by the Progmasoft Patent
+Grant, Version 1.1, identified as `AdditionRef-Progmasoft-Patent-Grant-1.1`. Its
+canonical text is
+[LICENSES/AdditionRef-Progmasoft-Patent-Grant-1.1.txt](LICENSES/AdditionRef-Progmasoft-Patent-Grant-1.1.txt),
+as published in
+[Progmasoft/patent-grants](https://github.com/Progmasoft/patent-grants).
+
+This notice is what makes the grant apply (Section 9 of the grant). The SPDX
+expressions of the files name their copyright license alone; the grant is a
+separate permission and does not appear in them.
+
+The grant is additional to the repository's copyright license, LGPL-3.0-or-later
+for the Progmasoft-authored files. It does not change the license of third-party
+material, and it removes no notice or attribution duty of that license or
+another applicable license.
+
+A file's presence in this repository does not by itself make it project-owned or
+covered. Third-party material and material carrying another copyright holder or
+license remain under their stated terms.