> his was published long before yours

That's not enough. What if someone publishes before the author. Say I buy something from other resource or even directly and publish it on the OP's.

I don't follow. Could you elaborate?

You know how you can download someone's video from YouTube, upload it somewhere else and make money off of it; what's stopping you from doing something similar with pictures here? Even better, with ether.camp you're an "author" since you published it first!