Unpacking .pak files from DJMAX

I was wondering if anyone knows how to decrypt/unpack .pak files for the game DJMAX Trilogy for PC. The reason i want to do this is to see the game data since all of it is in .pak files that i cannot extract or open. It would open the possibility for custom song creation if it was possible to add in data and repack it. But aside from that this is just for curiosity sake. I don't think i can upload a small .pak file from the game cause it could be considered copyrighted material? I could PM anyone who wants to try it or if you already own the game that works too. Thanks.

Heyllow,
I'm at the end of my prototype tool for extract DJMax trilogy *.pak files but some files are still crypted(not the most important).
And for a repak, I'll need to know really from the *.pak for the game accept it with no problem.
I'll share it when my tool will be ready.