So apparently the woman who posted the video (mom to the adorable kid dancing to "Let's Go Crazy" by Prince) has received a take-down letter from Universal Music Publishing Group warning that she is infringing the artist's rights to the song. They also noted that they were acting "at the behest of the artist."
Now, I do intellectual property law and I'm all for protecting your rights, but, um, isn't Prince taking things a little too far? I'm not too familiar with the US concept of fair use (which permits use of part of a copyrighted work for certain non-commercial purposes), but I kinda feel like posting a video of your kid dancing so Grandma and Grandpa and Auntie Susie can see it would probably qualify...
And Prince, if you're reading this, please don't sue me. I think you're awesome.