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Pluralistic: "If buying isn't owning, piracy isn't stealing"
(pluralistic.net)
This is a most excellent place for technology news and articles.
I absolutely agree with you that the arguments you put forward is the way it should be. However, currently, as we see here in the case of Sony, there is a perceived unfairness in what consumers expect from a license agreement and what is in fact in them.
Time will tell if our judicial system acknowledges that it's reasonable to assume that if you are offered a digital good "to buy" that it will remain available ad infinitum and hence Sony held to be liable.