When you download a file from the pc playstation store it saves a .XPD file to your computer. This file is used by the playstation network downloader to download your content (game, demo, etc). I was messing around and noticed that if you open the xpd with a text editor it reveals that it downloads a pkg and extracts it. My theory is by changing the pkg url in the xpd and also some other info that we could use this tool to extract ps3 pkgs.
Example XPD:
[Info]
EID=pngc
Desc=『まいにちいっしょ』PSP®用カス テーマ
Size=247824
[File]
C=http://zeus.dl.playstation.net/cdn/JP9002/NPJA90054_00/awNJC8v74OLOMoR3FpL4YO3cq7MY1YXVfY1OyXM6e6Dp91UjH5 uAhPKyfsFFMla9T9WWhGJe6xfWfQTnDnIHkWxL7bXdwc1rt9yF G.pkg
[DrmPNPD]
AID=d6ff6e5107839a30
CID=JP9002-NPJA90054_00-MAINICHICT000001
LID=asksin@gmail.com
EPW=B196215E8EFE978DC16F51E0A5EB5A0D23515D705070C3 AE7A2750BDA5D7AE9BBE8CD1D753D60A27C8958D43E35AB5DA
KD=https://store.playstation.com/kdp.m
CA=https://store.playstation.com/cap.m
[DrmMGN]
T2=http://sclock.ww.np.community.playstation.net/mgntt/get
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