this shit is RIDICULOUS! (important) edit
this is not enterily true, this was a hoax, well, kinda.
i feel confused about this, 'cause i feel like the agreement is the other way around, but what remains true, is that even if dA' will not sell your artwork to third parties, they still can edit it and use it. and just like analwhisper says:
That still doesn't change the fact that your work is royalty free and people can still use it, edit it, and use for advertisement so I STILL encourage everyone to put copyright claims on your work.
Truth is this always happens, redbubble and hot topic especially have used a LOT OF fan art without retaliation, the misconception was that deviantart SUPPORTED the behavior.
but the rules allow deviantart to make the work "royalty free" so it can be used as a reference, can be used and manipulated and made to be someone else's work, deviantart can advertise w