License update

LICENSE.txt

@@ -1,17 +1,22 @@
 
 JSON-CPP-GEN
-Copyright (c) 2021 Viktor Chlumsky
+Copyright (c) 2021 - 2023 Viktor Chlumsky
+https://github.com/Chlumsky/json-cpp-gen
 
-This software is provided under a dual license:
+This software and its documentation can be copied, modified,
+or redistributed freely as long as the above copyright notice and this
+licensing information is retained in each copy, unchanged.
 
-- For GitHub Sponsors of Chlumsky, with an active monthly subscription
-  to the second available tier or higher, the software and its output
-  is provided under the MIT license (https://mit-license.org/).
+For non-commercial purposes, the software can be used by any person,
+free of charge, as long as the "generated by" attribution and project URL
+is retained in source code generated by the software.
 
-- For everyone else, the software may only be used for non-commercial
-  purposes and cannot be redistributed. Its output may also only be used
-  for non-commercial purposes but may be modified or redistributed as long
-  as the "generated by" attribution notice and URL is retained.
+To use this software or its output commercially, the user must be a GitHub
+Sponsor of Chlumsky with an active monthly subscription to the second
+available tier or higher at the time of generation, or a written permission
+by the author. If either of these conditions is met, any output generated
+by the software is fully owned by the user, and the author yields copyright
+to any portions of the project's source code included in the output.
 
 The software is provided "as-is", without warranty of any kind, express or
 implied, including but not limited to the warranties of merchantability,
@@ -20,6 +25,3 @@ the authors or copyright holders be liable for any claim, damages or other
 liability, whether in an action of contract, tort or otherwise, arising from,
 out of or in connection with the software or the use or other dealings
 in the software.
-
-The above copyright notice and licensing information must be included
-in all copies or substantial portions of the software.