I purchased movies from Google play store on my nexus 7. My tablet quit working 2weeks after I purchased it. I sent it back and the repaired it but now I can't play my purchased movies. I get error 901 - can't fetch liscence??? What foes this mean and how can I fix this. Where are my movies stored and how do I retrieve them. Not sure I will purchase any more if this can't be fixed. Hope you can help.