Might iCloud Be a Musical Honeypot?
An anonymous reader writes "Between watermarked MP3 files and matching identical files, iCloud Music Match might wind up being a giant trap for finding owners of illegally copied files should the RIAA subpoena the evidence."
Because YouTube is looking for a particular song.
And Apple is looking for a particular song to stream it to the user.
The watermarks allow them to trace a song to the person who bought it.
So we have two separate pieces of information to convey: the identity of the work and the provenance of the copy. YouTube's Content ID adequately identifies the work, leaving inaudible watermarks to identify the provenance. Do you remember the SDMI challenge, involving watermarks that were allegedly inaudible but could allegedly survive a transcode?