go back to using the "or any later version" clause of GPLv3

I think arguments that "Such new versions will be similar in spirit to
the present version", in my own reading and readings such as in
https://www.draketo.de/software/gpl-or-later, convince me for now that
it is acceptable to allow the "or later" for compatibility and future
problem's sake

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

incorporealcms/__init__.py

@@ -1,7 +1,7 @@
 """An application for running my Markdown-based sites.
 
 SPDX-FileCopyrightText: © 2025 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import json
 import logging

incorporealcms/config.py

@@ -1,7 +1,7 @@
 """Default configuration.
 
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 
 

incorporealcms/error_pages.py

@@ -1,7 +1,7 @@
 """Process the error page templates.
 
 SPDX-FileCopyrightText: © 2025 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import os
 

incorporealcms/feed.py

@@ -7,7 +7,7 @@ under pages/ (which may make sense for a blog) if they want, but could just
 as well be pages/foo content.
 
 SPDX-FileCopyrightText: © 2023 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import logging
 import os

incorporealcms/markdown.py

@@ -5,7 +5,7 @@ as is, but .md files need to be processed with a Markdown parser, so a lot of th
 is our tweaks and customizations for pages my way.
 
 SPDX-FileCopyrightText: © 2025 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import datetime
 import logging

incorporealcms/mdx/__init__.py

@@ -1,5 +1,5 @@
 """Markdown extensions.
 
 SPDX-FileCopyrightText: © 2021 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """

incorporealcms/mdx/figures.py

@@ -1,7 +1,7 @@
 """Create generic figures with captions.
 
 SPDX-FileCopyrightText: © 2022 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import re
 from xml.etree.ElementTree import SubElement  # nosec B405

incorporealcms/mdx/pydot.py

@@ -1,7 +1,7 @@
 """Serve dot diagrams inline.
 
 SPDX-FileCopyrightText: © 2021 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import base64
 import logging

incorporealcms/ssg.py

@@ -1,7 +1,7 @@
 """Build an instance as a static site suitable for serving via e.g. Nginx.
 
 SPDX-FileCopyrightText: © 2025 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 """
 import argparse
 import logging

incorporealcms/static/css/base.css

@@ -1,6 +1,6 @@
 /*
  * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
- * SPDX-License-Identifier: GPL-3.0-only
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 html {

incorporealcms/static/css/dark.css

@@ -1,6 +1,6 @@
 /*
  * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
- * SPDX-License-Identifier: GPL-3.0-only
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 /* common styling via the base.css, used in light and dark */

incorporealcms/static/css/light.css

@@ -1,6 +1,6 @@
 /*
  * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
- * SPDX-License-Identifier: GPL-3.0-only
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 /* common styling via the base.css, used in light and dark */

incorporealcms/static/css/plain.css

@@ -1,6 +1,6 @@
 /*
  * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
- * SPDX-License-Identifier: GPL-3.0-only
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 /* specify almost no styling, just fix some image and nav rendering */

incorporealcms/static/js/style_switcher.js

@@ -5,7 +5,7 @@
  * of my CMS, so I want to keep it around even in the static site.
  *
  * SPDX-FileCopyrightText: © 2025 Brian S. Stephan <bss@incorporeal.org>
- * SPDX-License-Identifier: GPL-3.0-only
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 /**

incorporealcms/templates/400.html

@@ -1,6 +1,6 @@
 {#
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 #}
 {% extends "base.html" %}
 

incorporealcms/templates/404.html

@@ -1,6 +1,6 @@
 {#
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 #}
 {% extends "base.html" %}
 

incorporealcms/templates/500.html

@@ -1,6 +1,6 @@
 {#
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 #}
 {% extends "base.html" %}
 

incorporealcms/templates/base-wide.html

@@ -1,6 +1,6 @@
 {#
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 #}
 {% extends "base.html" %}
 {% block site_class %}class="site-wrap site-wrap-double-width"{% endblock %}

incorporealcms/templates/base.html

@@ -1,6 +1,6 @@
 <!doctype html>{#
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: GPL-3.0-only
+SPDX-License-Identifier: GPL-3.0-or-later
 #}
 <html lang="en">
 <title>{{ title }}</title>