Originally Posted by frahse
There are no guarantees except one, and that one is that if you give up trying to stop piracy because it is hard, you will then have more.
This is is the slippery slope fallacy, and not a great way to start your argument. Where's your evidence that releasing something DRM free results in more piracy of that item, aside from what your gut is telling you? And even if there's an uptick in piracy of that item, where's your evidence that there was a reduction in sale? As already said by others, if there's no reduction in sales the DRM is still a waste of time even if it reduces piracy.
The fact that DRM-free indie book bundles and game bundles still garner sales, even where they allow buyer's to set their own price (I'm looking at you Humble Indie Bundle), suggests that people will buy even where piracy is an easy option.
Further, the restrictive DRM suggested by the thread creator seems like it would drive people to try and find a pirate version that doesn't carry with it the annoying restrictions of the legitimate version. If you're this worried, I would suggest releasing only paper versions of the books, and assigning a security guard to each to ensure that your customers (all potential thieves anyway) don't try and take a picture or photocopy anything.