Dropbox - as well as other file sharing sites - cover their policies towards illegal filing sharing of copyrighted files in their TOS. (law.stackexchange.com)
«A key area of anti-piracy is to constantly be seeking out the hottest new illegal file sharing sites. (goodereader.com)
It is true that those who make available illegal copies of books are doing it for the potential income, hopefully new methods of accessing books without illegal file sharing would be enough of an incentive to avoid the easy route to book access. (goodereader.com)