There rules are in the Terms od Service:
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Any file is permitted under assumptions of fair use and/or ownership, irrespective of file format or content.
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and
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...Users may not use this site to distribute any material when they do not have the legal right to do so. It is the responsibility of each user to adhere to these terms. ...
and
…files whose (...) distribution are illegal (...)will be removed, such as: (...) Validated notification of 3rd party copyright infringement ...