I had a similar thought. A bride and groom upload a video resulting in 10 million views... and someone else who wrote a song a year ago makes money off of it.

I had a similar thought. A bride and groom upload a video resulting in 10 million views... and someone else who wrote a song a year ago makes money off of it. Clearly the copyright of the songwriter should be respected, but it seems to me the real value was the video itself. I know essentially nothing of copyright law, isn't there something covering "derivative works"? Would that have any application here? Further, does knowingly leaving this 'infringing' video up and pulling revenue from it give some sort of implicit acceptance to the next person to use the song without permission?