remove-ai-watermarks/docs/code-provenance.md

Code provenance

This page records notices required by source dependencies and licensed derivative work.

Licensed derivative work

• The DWT-DCT implementation derives from ShieldMnt's invisible-watermark, licensed under MIT. Its notice ships in src/remove_ai_watermarks/licenses/invisible-watermark-MIT.txt. The decode path is a vectorized reformulation, not a transcription: it produces the same bits and is checked against upstream's own decoder, but it no longer corresponds line by line to imwatermark/maxDct.py. Diffing the two files will show structurally different code, which is expected and does not mean the derivation notice is stale.

Licensed test fixtures

• data/fixtures/provenance/adobe-trustmark-p.png is Adobe's official TrustMark Variant P example, licensed under MIT. Its source commit, digest, and reproduced license are recorded beside the fixture in data/fixtures/README.md and data/licenses/adobe-trustmark-MIT.txt.
• data/fixtures/provenance/microsoft-paint-invismark.png is an original Microsoft Paint output supplied by Xusheng Li and licensed by him under MIT. Its source research, digest, expected signal, and reproduced license are recorded in data/fixtures/README.md and data/licenses/xusheng-li-paint-invismark-MIT.txt.