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You are going to have a problem there... no e-book system is "100%" proof against copying or redistributing e-books. If your books are already copywritten in your name (an easy process--easiest is to print it out, mail it to yourself to get a legal postmark on it, and leave it unopened), you'll have the law on your side, but that will probably not help you outside of your country.
Most of the posts here tend to be about avoiding DRM! But in your case, you need to figure out how to use it to your best advantage, with the understanding that applying DRM to your e-books could cause you to lose customers who avoid DRM e-books, but it will cut down on some, hopefully most, pirating. Browse the sites of the most popular e-book makers (eReader, MS Reader, etc) to see what DRM methods are available to you. Give some thought to which ones may turn out to be more trouble (to you and your customer) than they are worth. Then pick your favorite DRM methods.
A popular DRM method with publishers seems to be tying your book to an encrypted code connected to a credit card used to purchase the e-book. Few people will share their CC numbers with others, so it tends to be a key that will not be widely circulated.
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