"First sale" doctrine means that if you buy a product, you have a no-strings right to resell that single item to someone else. You still can;t sell copies of the item, or rent it out, or do anything else that "makes a single item into many".,p. Now if only this ruling could be applied to airline tickets...
So does this ruling clear the way for a hypothetical situation such as this?
I hang around a software store and see a customer buy a retail version of KillerAp 1.0.
I buy this software for a very low price after the original owner has had time to install it and of course make a reliable "backup" of the whole package.
Now that I own the "original" can I sell it on eBay?