Verno wrote on Sep 11, 2012, 12:47: I can understand their motivation in wanting to catch hackers who posted screenshots to websites and whatnot. That said, it seems like a big security risk to attach the account info to something that's posted publicly. I'm sure there is a general ToS clause that covers their ass but it still seems pretty dumb.
Apparently you can defeat it by using a different screenshot quality or compression method.
From what I gathered in the Reddit thread it is mostly just fluff info. Nothing that would risk your account: old log in from before b.net / some string after b.net & WoW server ip.
EDIT: Looks like now people are saying it is just gibberish Blizzard uses internally either way.