Encyption is the key word here. Encoded files are still safe. Like a jpg with whatever encoded in there. Or something along those lines. The law says nothing about handing over how you encoded a file into another.
Or, use true crypt and encrypt an encrypted file along with some porn. Legally you only have to give the key for the encryption on the outer shell. The encrypted file on the inside is safe as long as you don't title it 'me likey loli' or the bad guys find out that you have another encrypted file there. In fact I'd use non printable characters to label it and a completely invisible icon, maybe add a suffix that makes it look like a thumbs db file or an ini file. Then
encode the second file into a pic of Britney Spears' mangled vagina. No one will look at that pic for more than a second without getting sick and running away scratching their eyes.
See!!! Now your eye's hurt and you no longer want to search for terrorists!!
