What is PSSE?
PSSE Stands for PlayStation Suite Encrypted, its an encryption layer that encrypts a PSM game's filesystem, its comparable to PFS in alot of ways, however it seems there was a bug at sony where besides executable files, the first directory level of a PSM app is not encrypted with PSSE, its only directory levels below the root of RO/
also PSM SaveData does not get PSSE Encryption applied.
|0x00||0x50535345 (ASCII "PSSE")||Magic Number / File Header|
|0x14||CONTENT_ID||Contents of /RW/System/content_id|
|0x40||Signature||Generated by PSMSDK 'publisher key'? - Similar to sce_sys/clearsign file of NpDrm-Encrypted apps|
|0x180||Encrypted Keys||Generated by PSMSDK 'app key' and 'app seed'? - Similar to sce_sys/keystone file of NpDrm-Encrypted apps|
|0x680||Encrypted Data||Actual cipher-text for the encrypted file|