On: Entire cities dead on some World of Warcraft realms

[josso]

The watermarks was only added, if you used the builtin screenshot-feature of WoW, and only if you didn't had it on quality-level 10 (max). So it won't work with videos and I guess that the hackers haven't used the builtin screenshot-feature, if they have released pictures.

[EGreg → josso]

They could have rather easily added other watermarks, for videos, etc. There are lots of watermarking techniques that survive lossy compression.