Just to back my point further i managed to find the PPF-O-MATIC help text file and have copied the passage about how Video Rental games can be different to retail games, check this out:

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2nd. Warning:
"The binfile does not seem to be the same one this PPF-Patch was made of!
CONTINUE? (Suggestion: NO!)"

If you see this warning you have a serious problem! the binfile that
you want to patch was NOT identified to be the right binfile for
the PPF-Patch you are using! - It's very very likely that you will
burn a nice coaster if you continue! Get the right version of the
game you are trying to patch. Sometimes a RENTAL/STORE/BETA version can cause this problem! If you ask me.. i would NOT continue to patch this binfile!!!

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correct me if i'm wrong but doesn't the word RENTAL crop up somewhere in that passage . Like i said i dunno how the heck rental games would be any different to the games u buy in the shop, but from what Paradox say it seems like they could well be ...

I dunno whether this is true, but i'm sure i'm not the only one to experience problems with video rental games that create .bin files that are a different size to those that have been purchased from a shop. Its weird but i don't know why it is ...

l8er,

4nim4l.