John,

Thanks for a most clear and helpful summarization of the law.

On your chair example, I would carry it a step[ further and ask you the following question.

I am a carpenter and I am asked to design and build a chair for my customer. I do that. They have the right to resell the chair to someone else (once they sell the chair of course they can no longer sit in it), but do they have the right to construct more chairs based on my design and sell those without my premission (and continue to use the one they bought from me)?