There are very few books that allow loaning. If that is an option, then go for it. But removing DRM and giving away copies that you make is piracy. It is no different then owning a paper copy, photo copying it, and hand out the photo copies to whoever you want. If anything, it is worse because photocopying at least cost you some money and the copy was not as nice as the original. Sending a DRM free version to someone, or downloading a free version of a book, gives you an identicle copy with no cost associated to the person who removed the DRM and posted it to to web or emailed it to you.
Piracy, is piracy, is piracy. It is illegal. You can justify it any way you want, but it is illegal.
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