Alexander Pohl | Nurphoto | Getty ImagesA quarter century ago, Napster was notorious on the internet for allowing people to swap songs for free, long before the music industry had come up with a model for the digital age.The service was shuttered in 2001 amid mounting legal battles, and filed for bankruptcy the following year. But the brand isn't dead.On Tuesday, Napster was acquired by 3D technology company Infinite Reality for $207 million. Infinite Reality CEO John Acunto told CNBC in an inte...