[Rediscover]

I've been led to believe those video thumbprints exist, but I know the hash of the perceived audio is often all that is needed for a match of what is currently being presented (movie, commercial advert, music-as-music-not-background, ...).

[lurk2]

This is why a lot of series uploaded to YouTube will be sped up, slowed down, or have their audio’s pitch changed; if the uploader doesn’t do this, it gets recognized by YouTube as infringing content.