Can you please post the name of the decryption software ?
This is an old topic of discussion.
Should we use raw encrypted images or decrypted images?
For long term storage, ideally we would use 1:1 images but that's not really possible due to the fact that some parts of the retail BD game discs where some authentication data is stored (we don't much about this) cannot be read, unless maybe if using a hacked BD firmware to that effect.
The authentication of a disc is done with a pair of encryption keys, one stored in the BD controller, the other in the Flash Memory, that's why you must remarry a new BD controller, it's basically to update the key pair needed for disc authentication.
Then there is the per sector encryption.
Iirc the static retail disc key used for sector decryption can be found at sector 0x800 of a BD game (or something like that) but it's encrypted and must be decrypted by the one the isolated loaders, appldr I would assume.
If I am not mistaken, CFW tools found in Rebug and Evilnat CFWs can dump any retail game disc key decrypted.
Once you have the disc key, I think you can derive the encryption key for each disc sector with a simple algo that "wraps" the sector number into the disc key, something likely that. The algorithm can be found in the wiki if I am not mistaken, the encryption is basic AES CBC and the keys, static disc key and derivations, are all 16 bytes long.
If you have a BD drive in your PC that supports PS3 BD game discs, then you can look at the rpcs3 wiki for ways to dump and decrypt game discs.
https://wiki.rpcs3.net/index.php?title=Help:Dumping_PlayStation_3_games
As a general rule, to be mounted with Cobra or Mamba, an iso image must be decrypted and the most reliable tool we have to create decrypted images from folders and files (despite a few flaws) is makeps3iso, the same app can be used on PC and on PS3 (with different builds of course), it's integrated in Irisman file manager on PS3 and in Rudi Rastelli's tool for PC, on PS3, the rpcs3 wiki suggests to use multiman, personally I prefer Irisman for this.