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Blizzard does this: http://www.tomshardware.com/news/watermark-screenshots-World-of-warcraft-digimarc-MMORPG,17522.html http://www.tomshardware.com/news/waterma

• AlyssaRowan 12y ago
  Sneakily, Blizzard did (does?) that to include an account ID, seemingly so that they could catch people exploiting and then proudly posting screenshots (but editing out their character name). I've got to hand it to them, that is sneaky, but a bit underhanded. And you could sort of see something was a bit off in screenshots of the more gradiented blue skyboxes (in which it was more visible), but I'd thought that was just a poor JPEG encoding routine, until someone looked closer of course.