Depending on the country, getting hit with a DMCA notice carries more or less weight. The ones sending the notice might also need to be very clear about what yo

Depending on the country, getting hit with a DMCA notice carries more or less weight. The ones sending the notice might also need to be very clear about what you did wrong. And a notarized letter is less easily prone to spam and abuse than a message inside YouTube's system. And you'll be probably able to win in court if the claim is spurious. Much better than the current situation with YouTube's ContentID where the presumption of innocence is routinely violated, not to mention all the other issues : https://www.youtube.com/watch?v=trIn90HTqKs https://www.youtube.com/watch?v=trIn90HTqKs (Also, the way the current ContentID might be violating European laws deriving from Article 13, but I haven't really been following that lately...)