Universal wants no part of the purple one's oeuvre online, even if it's background music for a dancing toddler. Stephanie Lenz of Gallitzin, Pa., thought it might be fun last year to film her 13-month-old son Holden zipping around the kitchen while a Prince :fifixqr5ldhe single from the 1980s played in the background. Then she did what she'd done with several home videos of her toddlers playing or cavorting to music: She posted the half-minute clip of Holden to YouTube so friends and family could see it. Four months later, Universal Music Publishing Group sent YouTube a letter demanding the removal of nearly 200 videos involving Prince songs, including Lenz's, on the grounds that the clips violated copyrights. ...