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Some makers deliberatley place different errors at the CDs that are sold. Theese errors are supposed to stop illegal copying of the media. Error - meaning that they in some way do not follow the different standards, f eks they can emulate nonreadable sectors in the CDs filesystem.
Sometimes this prevents the user from making an ISO-image as an ISO strictly follow the rules. Other ways incl the bin/cue tries to catch the whole CD as is sector per sector, think about it as Ghost or another harddrive imageutil making an image incl botsector, filesystem and so on of a harddrive, thus including the errors. That's also why it's bigger. Different "errors" demands different methods to backup.
It's a good feeling having a reliable copy put somewhere. In fact I put my original CAD-stuff at the bank's safety-box and at home I only keep my copy... (Yes, a little overkill maybe.)
Then about really expensive stuff, it should be no problem to get a new copy from the maker in case your dog chewed it or something. You have payed for the license, not the media, and should be able to get it replace for a small fee.
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unicorn
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