It decrypts NUS downloaded files.
I have Cdecrypt v2.0b, which probably has never been released before in binary form. compiled by Maschell. I don't know if it works on 32bit or only 64bit.
This is the v2.0b from commit 3 on github, I included the source in the package.
Filetrip is dead.
I attached the files on the forum post instead.