Originally Posted by Jozawun
If ownership is the key factor, rather than direct or indirect purchase, then you get some odd results.
First, what of a person who becomes the legal owner of a stolen book by buying it at a market overt?
Second, what of a person who becomes the legal owner of a book gifted to him by a person who originally purchased it legally, and first used and copied it for his own purposes before passing it on?
In your second example, the keeping of a copy is the problem... if you buy a book, read it and give it to someone then no problem but giving and retaining a copy is both ethically wrong and a copyright infringement either civilly or criminally illegal depending on local laws...