I was impressed with Poweramp, bought the Pro version for my Android head unit. So I'm listening to music in my car, go to setting to play around, and I get a message saying "can't verify license." Now nothing works... I can see the songs but none of them will play. After I get home from my drive and get back on wifi, I have an option to "restore license." I had to run the unlock application again at this point to get my player working again. What a hassle! Looks like I threw away my $4. Next version, I hope the developer thinks about people who might use this mp3 player OFFLINE. Horrible licensing scheme. I can't use this.