Legally no one has the right to make a "copyright infringement" claim other than the original copyright holder. Technically they are supposed to "assume" (yeah yeah I know what they say about assuming) the files are legitimate unless contacted by the holder of the right to copy. They only become liable for infringement actions if they have been contacted and ignored the complaint and allowed the file to remain. Prior to notification they are not responsible for infringements. However it would seem good practice to also do a 2 strike thing or something similar - if a member has been known to violate copyrights 2x's or whatever they decide then the person should not be allowed to post or sell items for at least a set amount of time - if ever. That protects 'rosty and saves them the time of always checking that person's files. Just a thought.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo