Seriously, only "geeks" read blogs.
Stay sub-atomically stable, my friends.
I can easily lock my car to keep valuables inside it safe without the government's involvement. And the government is completely powerless to stop someone from smashing the window to get in and take my valuables.
For the record, I'm not speaking strictly of capitalism, but rather free markets. There is a difference. Adam Smith didn't write "The Wealth of Individuals." So if he is the basis of your capitalism then, yeah, there is a governmental role and it is not, strictly speaking, a basis for a free market.
Many patents are filed defensively since someone else could use the force of government to prevent Amazon from conducting free market business in the future by getting this patent.
The patent, copyright and entire IP systems is not a construct of the free market and we could be so much further advanced without these government interventions.