[ksanyok]

Problem

_scan_markers matched generator signatures as raw substrings of the lowercased metadata. Two kinds of human audio got "Generator signature: Udio (audio), high", risk 1.0:

• files from DAWs named "… Studio" (FL Studio, Studio One, Sound Studio);
• files with XMP audio fields such as xmpDM:audioSampleRate.

The PromoPilot audio watermark detector runs on this module and has been used about 1,200 times since 13.10, so users saw these wrong verdicts.

Fix

• Every signature now matches only as a whole token: no letter or digit right before or after it.
• Names that are also ordinary words need generator context as well: udio, suno, sora, pika, flux, runway, gemini, playground, firefly, imagen. The context can be any of:
  • a domain: suno.com, udio.com, pika.art;
  • "made / created / generated … with / by ";
  • <name> ai, a version (v4, 2), or FLUX.1-dev;
  • a vendor phrase: "OpenAI Sora", "Google Gemini", "Adobe Firefly", "Runway Gen-4", "Pika Labs", "Black Forest Labs";
  • for udio and suno only, a metadata value that is exactly the name. This keeps a RIFF ISFT "Suno" tag detected, as the existing test expects.
• Distinctive names keep working with the token match alone: midjourney, elevenlabs, comfyui and the rest.

Tests

New tests in tests/test_media_watermark.py:

• Not detected: "FL Studio 21", "Studio One 6", "Sound Studio", "xmpDM:audioSampleRate", "Runway Lights", "Firefly - demo take", "Influx mixdown", "Gemini Records", "Playground session", "Pikachu remix".
• Still detected: "Made with Udio", "Udio", "https://suno.com/…", "Suno AI v4.5", "FLUX.1-dev", "OpenAI Sora", "Runway Gen-4", "ElevenLabs".

pytest tests/test_media_watermark.py tests/test_watermark.py: 30 passed.

Real files, run on the PromoPilot server:

Set	Before	After
23 human recordings from Wikimedia Commons, uploaded before 2022	2 flagged as Udio (h03.wav: RIFF "Sound Studio"; h13.mp3: xmpDM:audioSampleRate)	0 flagged
21 Suno samples	0 flagged by generator signature (they carry no text marker)	0 flagged

So no real generator detection is lost.