Kingdom Hearts: Birth by Sleep - US - ULUS10505

[Darth1701]

Successfully allocated buffer of size 8388608 for stream 0
Successfully allocated buffer of size 8388608 for stream 1
Command: DecodeVideo
Parameters: ms0:/tmp/Movie.pmf
ms0:/PSP/GAME/JpcspConnector/JpcspConnector.prx
Loading PSP_AV_MODULE_AVCODEC
Loading PSP_AV_MODULE_MPEGBASE
Loading PSP_AV_MODULE_SASCORE
Loading PSP_AV_MODULE_ATRAC3PLUS
Loading JpcspConnector.prx
Successfully allocated buffer of size 8388608 for stream 0
Successfully allocated buffer of size 8388608 for stream 1
Command: DecryptPGD
Parameters: ms0:/tmp/PGDfile.raw 18e597e96c559ad378ded05f3c25ab9c
FileName: ms0:/tmp/PGDfile.raw
Key in Hex: 18e597e96c559ad378ded05f3c25ab9c
sceIoIoctl 0x04100001 result: 80510204
Output FileName: fatms0:/tmp/PGDfile.raw.decrypted
sceIoRead result: 80510206
Command: Exit
Parameters:
Duration: 0 s
ms0:/PSP/GAME/JpcspConnector/JpcspConnector.prx
Loading PSP_AV_MODULE_AVCODEC
Loading PSP_AV_MODULE_MPEGBASE
Loading PSP_AV_MODULE_SASCORE
Loading PSP_AV_MODULE_ATRAC3PLUS
Loading JpcspConnector.prx
Successfully allocated buffer of size 8388608 for stream 0
Successfully allocated buffer of size 8388608 for stream 1
Command: DecodeVideo
Parameters: ms0:/tmp/Movie.pmf
ms0:/PSP/GAME/JpcspConnector/JpcspConnector.prx
Loading PSP_AV_MODULE_AVCODEC
Loading PSP_AV_MODULE_MPEGBASE
Loading PSP_AV_MODULE_SASCORE
Loading PSP_AV_MODULE_ATRAC3PLUS
Loading JpcspConnector.prx
Successfully allocated buffer of size 8388608 for stream 0
Successfully allocated buffer of size 8388608 for stream 1
Command: DecodeVideo
Parameters: ms0:/tmp/Movie.pmf
ms0:/PSP/GAME/JpcspConnector/JpcspConnector.prx
Loading PSP_AV_MODULE_AVCODEC
Loading PSP_AV_MODULE_MPEGBASE
Loading PSP_AV_MODULE_SASCORE
Loading PSP_AV_MODULE_ATRAC3PLUS
Loading JpcspConnector.prx
Successfully allocated buffer of size 8388608 for stream 0
Successfully allocated buffer of size 8388608 for stream 1
Command: DecodeVideo
Parameters: ms0:/tmp/Movie.pmf

This is it , right ?
I get a PGDfile.raw.decrypted file but its 0 kb

I don't have that line, I think this is some sort of error code, don't know what 80510204 means: sceIoIoctl 0x04100001 result: 80510204

This may be far fetched but maybe you have not enough free space? How big is your first PGDfile.raw? How much free space do you have before decrypting?