Hykem Has has written a tool which would let you decrypt your edats.
From the readme:
Make_npdata is a tool to encrypt/decrypt/bruteforce EDAT/SDAT files from PS3 games. Written by Hykem.This tool aims to provide a fully working open-source solution for EDAT/SDAT file handling. It supports EDAT/SDAT decryption and decompression, encryption (compression is not yet implemented) and dev_klic brute-forcing.
Credits:
JuanNadie (original EDAT algorithm implementation and research)
flat_z (rap2rifkey algorithm)
Snowydew, KDSBest and qoobz (EDAT related tools and source code)
Source: Here
