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What you want is an E-commerce system. There are thousands out there and everybody can tell you their favorite.
Since you are using PayPal look for one that says "PayPal compatible" most have (but look) to see if it says "e-book compatible"
Your server will have to have "mysql" on it for this type of system to work. The price you'll pay is a lot cheaper than you trying to make a hack proof system. (prices start around $100)
Since you are new to this type of system, I suggest you look for a company that will install it and test it for you. It will save on headaches.
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