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Re:Be careful what you copy: Invisibly inserting usernames i... by Fnoord on Wednesday April 04, 2018 @06:23AM (#16753441)
Screenshots made in World of Warcraft contain a watermark which contains the account number of the player, as well as other info [1] [2]. This is used to find/combat cheaters (e.g. botters).

As for spying, I'm pretty sure this is a problem in high end raiding in WoW. But due to the nature of WoW (not being a king of the hill MMO to rule land) not nearly as much as EVE. Blizzard uses it to combat cheating.

[1] http://www.tomshardware.com/news/watermark-screenshots-World...

[2] https://eric-diehl.com/world-of-warcraft-and-watermarking/

Re:Be careful what you copy: Invisibly inserting usernames i... by earenndil on Wednesday April 04, 2018 @11:30PM (#16761543)
Couldn't someone just black out the watermark?
Re:Be careful what you copy: Invisibly inserting usernames i... by Fnoord on Thursday April 05, 2018 @05:09AM (#16763145)
In this case not. The watermark is all over the place, viewable when you zoom in. The alternative is to use a 3rd party tool to make screenshots such as Greenshot, ShareX, or Gyazo.