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I'd suggest two things:
1 - when we say an ebook is worth a "few" dollars (I usually think around US$5), we're talking about fiction, not technical books
2 - Look into "social DRM", by which I mean a system that embeds the purchaser's identity in the text, for all to see. Include a valid email address (confirmed by response of purchaser) and phone number. You don't have to worry about making it impossible to remove. This will slow up anyone that more customary DRM would work on, and won't irritate your customers nearly as much as regular DRM.
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