I've noticed that for videos that feature music, a new trend has appeared where users post something like I don't own the music.What's the reason for this?Does it really prevent YouTube from removing the video?Does it have any legal merit at all?Is it simply a viral thing where they see other people post it so they do it themselves?
Why do people post I don't own this song on YouTube videos?
youtube;legal
Note: I have no legal background, other than spending time reading up on some of the cases concerning copyrights and the DMCA.It is most likely from a lack of education concerning copyright infringement and the viral nature of YouTube.  It does nothing to prevent YouTube from removing the content if the true copyright holder can prove the infringement.  Plus there's no legal basis for it as they are still technically committing copyright infringement.As Ivo commented, the best they're doing is admitting they have no rights to the song.