A friend did some work (research and analysis) for an acquaintance. There was a verbal agreement of payment of $200 upon: a) delivery of the work; and b) payment to the acquaintance by the end recipient of the totality of the work. My friend has not yet delivered the work to the acquintance because she has now stated that she may refuse to pay, and she is also demanding delivery of the work as she "owns" the intellectual property; although my friend is the primary author of the work. What laws exist around intellectual property ownership and authoring, paid/unpaid work, etc. that could guide my friend's actions and dealings with this acquaintance (who is acting very threatening).