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Not an expert, but suppose that someone who has bought your book wants to share it with a friend:
With DRM:
1) He can get another copy for his friend
2) He can hack the DRM
3) He can give up and not share it with his friend
Wihtout DRM:
He will share it, equivalent to option 2 of hacking it.
I believe the share of people who do option 3 with DRM-ed books is fairly high. Is it worth killing a significant part of the buzz about your book in order to cash in the few people who will choose option 1?
In my opinion it's a definite NO.
But again, I'm no expert.
Ciao!
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