Pacemaker wrote:
Yes, that happens when YT scans your audiotrack and detects its analogy to the one of a copyrighted song. It doesn't even matter if the vid's popular or not.
This happens often on upload, but this video was up for over a year with no issues, then suddenly got a copyright notice, meaning they specifically asked for it to be taken down.
I also have 2 Vocaloid songs that "match 3rd party content", which just means they put ads on my video. [I don't care, I wish more copyright holders would just do this!]
The others are fairly random, but yeah, most were matched on upload, some were matched MUCH later, either by report or otherwise.