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1) User buys a file from the rights owner and explorers it into his Dropbox

2) User obtains a blockwise hash of the file and runs dropship on it

3) User obtains a public URL from somebody who has the file and downloads the file from the Dropbox web server

The point is that the Dropbox server cannot distinguish 1 from 2, but both from 3. Therefore, 2 should be more robust against takedown notices than 3.

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