You don't have to "lend" books, you can just make a digital copy and give it to your friend. Anything less than that is software and hardware that is purposely crippled in order to manufacture an artificial scarcity.
http://www.cracked.com/article_18817_5-reasons-future-will-b...
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#4 To Stay Afloat, Businesses Have to Pretend Unlimited Goods are Limited
A. Why can't the library just buy as many digital copies as are needed for the customers, and keep them forever, if they don't naturally degrade?
B. Wait a second. It's just a digital file. Why not just buy one copy, and just copy and paste it for every customer who wants to read it?
C. Wait a second. Why do you need the library at all? Why can't a customer just buy a copy from the publisher and "lend" copies to all of his friends?
D. Wait a second. If no printing and binding needs to be done, why do you need the publisher? Just buy it directly from the author.
E. Waaaaait a second. Why buy it? Once the author makes one copy available, why can't everyone just grab it for free?