Update license: CC BY-NC 4.0 -> CC BY 4.0

Weights are now released under CC BY 4.0 (open, commercial use permitted
with attribution). The released weights do not redistribute raw audio;
the internal 56-class SED training corpus remains non-public under an
in-progress data-sharing agreement.

The DGPU framework and CCED2 unknownness score (the methods that consume
these weights) are subject to patent applications filed by Biologging
Solutions Inc.; the CC BY 4.0 license on the weights does not grant
rights under those patents.

README.md

@@ -1,5 +1,5 @@
 ---
-license: cc-by-nc-4.0
+license: cc-by-4.0
 tags:
 - audio
 - sound-event-detection
@@ -106,12 +106,20 @@ above to ensure file integrity.
 
 ## License & Data Availability
 
-**License:** CC BY-NC 4.0 (Creative Commons Attribution-NonCommercial 4.0
-International)
+**License:** CC BY 4.0 (Creative Commons Attribution 4.0 International)
 
-These weights are released for **non-commercial research purposes only**.
-Commercial use is strictly prohibited without prior permission from the
-authors.
+These weights are released under CC BY 4.0 (open, including for commercial
+use, with attribution). The released weights do not redistribute raw audio.
+
+The internal 56-class SED training corpus itself remains non-public under
+an in-progress data-sharing agreement within the original collaboration;
+representative class examples and a per-class taxonomy are planned for
+release in a forthcoming companion paper.
+
+The Detect-Group-Promote-Union (DGPU) framework and the CCED2 unknownness
+score (the methods that consume these weights) are subject to patent
+applications filed by Biologging Solutions Inc.; the CC BY 4.0 license on
+the released weights does not grant any rights under those patents.
 
 > **Note:** The source code for using these models is released under the
 > **MIT License** at the GitHub repository linked above.