Before anyone bothers "correcting" me with nonsense about buying a license instead of a copy, don't bother. As we speak, the Amazon page for that book says "buy now", not "buy a license now", or "license now". By any reasonable interpretation of reality, I'd be buying a copy of it. That doesn't mean it would be OK to share that copy outside my household, any more than I could photocopy a physical version and pass it around. It's impossible to convince me that it's wrong to share a copy with my wife, any more than it'd be wrong to lend her my physical copy after I'm done reading it.