Is posting Bootleg screenshot images more than once a bannable offense?

[BurtReynoldsMoustache]

How do you define bootleg images? Technically, every screenshot on this site could be considered a bootleg. None of them are cleared by the copyright holders, and fair use exemption is the only thing keeping this site from being sued into dust.

And how can you tell if an image fits your definition of being "illegal"? There's no way to tell if a screenshot is taken from a bootleg DVD rip versus a legally purchased copy.