No offense toast, but Kinsella's paper "Against Intellectual Property" is found in a Google search and is an easy read. Also, there's a number of YouTube videos where he's given speeches on the topic.
I basically framed Kinsella's argument in such a fashion that [Person_I_Was_Talking_To] cannot reasonably reply in favor of intellectual property.
This is a libertarian-utilitarian position that relies on the false premise logical fallacy.
1) If a person has innovated, it is because of intellectual property laws protecting their work.
2) Innovation makes people happy.
3) Therefore, we should support intellectual property laws.
The premise here, #1, while syntactically-correct, is actually incorrect. Utilitarians take this for granted, however. They rely on the fact that their audience accepts that the premise is the only possible conclusion for why people innovate. They also use words like "optimal level" if you disagree that intellectual property laws provide innovation. However I asked a few questions on the free market to get [Person_I_Was_Talking_To] to verify he only legitimately saw a need to intervene in the market if there was a market failure. This is a distinction from "optimal level", because libertarian-utilitarians distinguish themselves from left-utilitarians in that they want to practice restraint, and only intervene if absolutely necessary. In other words, they don't want to make subjective calls.
My point here was that when it comes to deriving man of his liberties, the onus is on the person wanting to take the liberties away to actually and legitimately prove that it is worthwhile. This is why I asked for just one example where there was a clearly-measurable increase in happiness due to IP law.
With public goods like a lighthouse, you could reasonably make such an argument because you can potentially find more people benefiting from it than paying for it, especially over time.
However, with intellectual property you cannot, because there is clearly at least one person upset that you are punishing them, and the increase in happiness for the person holding the intellectual property is immeasurable and cloudy at best. Additionally, it is unreasonable to make the argument that their happiness is greater than that of the person you are punishing, or the next person, or the next person, or the next person...
Man has an innate evolutionary (or God-given) desire to reproduce, this means we will innovate in order to gain whatever possible edge we can over other potential mates. We don't need artificial incentives to do this, and, in fact, I contend that such encumbrances only hinder innovation. That's basically my point and that is what empirical evidence shows. The first man to make the wheel did not do so because his work was going to be protected. Shakespeare based most of his works off of other's IP and reinforced his "copyright" by regularly updating and revising his plays, not using government thugs. Game developers today enforce their IP by making content "subscribable". IE, you pay a monthly fee.
Monthly fees are the model for most current and future IP that I know of in movies, games, and music. A smart theater of the "future" should be offering a subscription-based model where you pay a monthly fee to watch movies on the big screen. These changes do not require government intervention and are a great business model for the current environment.
For Kinsella's full paper (where he makes the points against the deontological argument, primarily):
http://www.mises.org/journals/jls/15_2/15_2_1.pdf