If the data exists - even momentarily - on a machine in the user's control or physical possession and the user cares enough, he will be able to view the data. Period.
in reply to Re^2: hiding the information in txt files
in thread hiding the information in txt files
You cannot prevent this. If you want to follow in the footsteps of the movie industry, you can spend very large amounts of money (definitely in the hundreds of millions of US dollars, probably billions) trying, but you will fail, just as they have failed.