The point of twiifm was not whether Monsanto or Microsoft could exist or not without state.
The point is what happen if a powerful company violate NAP, which can happen, and Rothbard talks about the subject a lot. And which I explained in my previous post.
By the way, Microsoft might have been helped by patent to get where they are, but let's be clear : today, it is a truly great company, and thrive not because of government and patent protection but because customers love their product on overall. I am one of those. (That said, I don't defend windows 8 atrocities, but Microsoft is way more than that
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I don't like IE (I used to be a web dev), but it is a violation of NAP to prevent Microsoft to give IE free and by default on their own OS.
Microsoft's entire business model relies on the concept of intellectual property and using the threat of government force by making "unauthorized copying" of their software a crime.
I don't agree with your point. A patent for licensing an idea is clearly wrong from libertarian perspective.
But I don't see how it is against NAP that Microsoft do not want you to copy your software.
Buying a software is a contract where you exchange software against conditions and money, and you sign it by using the product. If the contract specify you should not copy the software, then you should not.
It is a valid breach of contract of copying, and should be judged as a NAP violation.
But the contract should not be enforced by public means.
If someone develop a better substitute, he should not be prevented to do so because of patent violation.
In the case of a violation of contract, the victim (Microsoft) would need to be compensated by the violator. The problem is that such violation is so minor and widespread, that it can't be enforced cost effectively.
I suspect that in a libertarian world, as they are doing now, Microsoft would only control companies for their licensing, and not consumers for this reason.
In fact the whole music and movie industry fall into the same bucket. The problem (in france) is that government is fighting for them to make pursuit cost effective for the company. (If the government see you are downloading torrent of some label, they can ban your internet connection)
Without such government enforcement, music and movie industries would always exist because there is more supply than demand, but would find different and more enforceable business model. (concerts, premium package, cinema, or other derived product)