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Here is a BRDGEN output of Heavenly sword ISO contents:


Code:
LBA:        File name:
0002368 , \PS3_DISC.SFB
0002369 , \PS3_GAME\PARAM.SFO\
0002371 , \PS3_GAME\ICON0.PNG   \------------- Plain Files, not encrypted
0002392 , \PS3_GAME\ICON1.PAM   /
0003751 , \PS3_GAME\PIC1.PNG    /
0004892 , \PS3_GAME\SND0.AT3  /
0005044 , \PS3_GAME\PS3LOGO.DAT ---------- actually an ordinary .PNG file

0005056 , \PS3_GAME\USRDIR\EBOOT.BIN --------------- encrypted like the rest of files
............
11643410 , \PS3_GAME\USRDIR\HS\content_ps3\content_information_files\gamedata\icon0.png ------------same ICON0 - but encrypted
............
11646083 , \PS3_GAME\USRDIR\HS\content_ps3\content_information_files\savedata\icon0.png ------------same ICON0 - but encrypted
............
11721696 , \PS3_UPDATE\PS3UPDAT.PUP -------------- funny thing, this one encrypted too.
encrypted contents of ICON0.PNG are different. different IV's but same cipher key? or is it just an encryption sceme based on disk offset of file?

What do you think? what kind of encryption used?