Need help!! Trying to play a movie on my PS3.

Since it says u hav 2 update the system to renew the encryption key, then update the system lol
go to settings then system update and it will update it to the latest firmware or u can dload it from the playstation website, this will probably solve ur problem :D

ohh and just to clarify sumthin...what type of movie r u playing, a dvd? and if so is it PAL or NTSC. if u hav a PAL ps3 and u are trying to play an NTSC movie on it, then sadly it wont work...

hope this helps! :D