God I am lost for words about this, http://www.geekwire.com/2013/amazon-wins-patent-reselling-lending-used-digital-goods/ and the /. thread on the matter http://news.slashdot.org/story/13/02/05/0212200/amazon-patents-maintaining-scarcity-of-goods
boils down to money. whats new
Prior invention, prior disclosure, patent is utterly invalid even in America. Problem is the nuisance of lawsuits that people might settle rather than fight. This can be a lucrative alternative to actually selling anything or doing anything useful. Hopefully this is just a defensive action by Amazon to preempt some of these chancers.
The USPO even issued a patent once for a business process that involved sitting at a desk answering enquiries, I think, with the aid of a database. American patents are moving away, hopefully, from allowing things like Genes, which are discoveries, to be patented rather than processes which are legitimate areas for patent.
My favourite American patent was the 19th century one for a safety pin whose principles had been demonstrated something like four thousand years before with some bronze brooches.