Today a lot of websites that allow the upload of media content are implementing automatic sound signature checks to prevent the illegal distribution of videos containing copyrighted content.

  • How does the sound recognition system work?
  • How could such an algorithm be tricked?
  • Could the sound be altered enough to change the sound signature without significantly changing the human experience of the sound?

1 Answer 1


The recognition software is just comparing hashes/fingerprints...

see: http://en.wikipedia.org/wiki/Acoustic_fingerprint & http://en.wikipedia.org/wiki/Hash_function also might be of interest: https://stackoverflow.com/questions/2068286/music-recognition-and-signal-processing

and yes, you can get fake out many of those platforms (for whatever your perfectly legal purpose is) One possibility is detailed here: http://www.turkeymonkey.com/2009/07/19/how-to-get-around-that-pesky-copyrighted-audio-filter-on-youtube-and-facebook/

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