lexipixel - 6:56 pm on Apr 20, 2012 (gmt 0)

The filters also catch digital audio, (no "words" needed in any part of the upload file name, description or other textual signals).

I uploaded a video of my daughter participating in a dance recital - I got an alert from YouTube that the video contained copyright material -- it had detected the digitally encoded background music, flagged it and blocked the video from being viewed.