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Comment Digimarc? (Score 2) 284

If I'm not mistaken, Photoshop has had "Digimarc" watermarking in it since forever (under Filters). You only get a "demo" ID in the base install (you have to pay for your own personal ID), but the demo would likely be sufficient since you're only really interested in watermarked sample vs. original work. The watermark itself is practically invisible, and meant to be resistant to the sorts of minor edits you're talking about.

Real Programmers think better when playing Adventure or Rogue.