You can't 'give up access to a URL'. The contents of the page that URL points to, maybe. But not a URL.<p>This is NO different than any other DRM, except that it requires you to be online to use it. Other DRM schemes allow lending, etc.<p>I can't imagine why someone thought this was a good solution to a problem... Or what exactly they thought that problem was.<p>Personally, I buy DRM-free ebooks and don't share them. I buy them for my use, on any machine I want (or paper, if I choose) but when I bought them, the deal wasn't that I could copy them for friends. Lending is a possibility, but not something I've done yet. Generally, if they are that good, I simply encourage them to buy the book also. Or, you know, go to the library.<p>In fact, the last physical books I lent out never found their way home. Still a little upset about that.