i loaded a bunch of mp`3s to a cd and then downloaded them to my pc and transferred them over to serato. i get this padlock icon next to all the songs from the mp3 cd i downloaded. i tried to build overviews for all the songs from the mp3 cd but no audio overview signal shows up. i also tried to edit the mp3 songs and no luck! can anyone tell me how to remedy these 2 problems? thanx.