> Dropbox checks the hash of a shared file against a banned list, and blocks the share if there’s a match.
Encoding an mp3 is not a deterministic process. So if multiple people start with the same .wav file ripped from a CD (which itself may introduce errors) and then downcode it, they will end up with files which sound the same but are slightly different (and therefore hash differently).
So, it should be straightforward to test whether Dropbox does anything more sophisticated than what's described in the article.
Encoding an mp3 is not a deterministic process. So if multiple people start with the same .wav file ripped from a CD (which itself may introduce errors) and then downcode it, they will end up with files which sound the same but are slightly different (and therefore hash differently).
So, it should be straightforward to test whether Dropbox does anything more sophisticated than what's described in the article.