I think you misunderstood me. Shall we start again......
In your first post you mentioned that it (what?) said that you couldn't play the film because it was protected. This just can't be the case, the film doesn't play on your TV, it's the iPad that it is playing on.....so can you view it on your iPad? If no, then there may be a problem with the movie file itself.
If it can play on your iPad then it plays, period. So now the question is, why won't it appear on your TV. First question, what, exactly, is the error that appears and does it appear on your iPad or your TV? Second question, do you have an iPad 1 or 2? If its an iPad 2 then at the very least it should appear with mirroring? If its an iPad 1 it should still appear on your TV but not through mirroring.
So, let's get those answers together then we can start to work out what is wrong.
The Archangel