I've seen videos done by people that have copyright music in their videos (not approved nor mentioned in the description), though there tends to be many clips of copyright songs in a single video, and they aren't flagged. From my understanding, if your video gets flagged for using copyright music, then it can't be viewed on mobile devices. Is this the case? If so, is that all that happens if your video is flagged for copyright music? How do you stop from getting flagged when using copyright music? Do you have to keep the song clip under a certain amount of time? Do you have to "transform" the song a little in an audio editing software program?