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Dropbox Attempts To Kill Open Source Project | Razor Fast - http://razorfast.com/2011/04/25/dropbox-attempts-to-kill-open...
an open source project called Dropship that allows users to exploit Dropbox’s file hashing scheme to copy files into their account without actually having them. Dropship will save the hashes of a file in JSON format. Anyone can then take these hashes and load the original file into their Dropbox account using Dropship. ‎- courant