As a business major, the biggest restriction on innovation is to NOT have a patent system or a system of intellectual property rights. Without the patent system, there is no motivation to invent something new, because those with more money and resources than yourself can simply copy your design and gain the profits. You will never have a chance to profit off your innovation because you will never have as many resources as the microsofts of the world....who will use those resources to capitalise on your idea/invention before you have a chance.
Like it or not, the patent system protects the "little guys" and encourages innovation.
That's just it. I'm not interested in a system that "protects" me if I must give up my liberty in exchange. For example, If Bob sells Sam a product that Joe invented without compensating Joe in any way, neither Bob nor Sam are using force against Joe. In fact, the whole thing has nothing to do with Joe at all! It's a mutually voluntary exchange in which Joe has no say.
What about Joe's innovation? If he were wise, he would have approached a producer with a nondisclosure agreement and asked them to make and sell his product for a royalty. The producer, being the only one privy to the knowledge of Joe's invention before it hits the marketplace, could rapidly flood the market with the product and make it difficult for competitors to enter. They would, eventually, of course, but not before Joe received a handsome sum for his work. Further, companies would be able to bring prices on the product down sooner than in the arbitrary 17-year (or whatever it is) life span of current patents. Instead of focusing on a cheaper product than the original producer, they would also be forced to innovate on the idea in order to find a profitable niche.
All that is fine, but the point to take away from all this is that it is important to do the right thing, not look for some outcome that you think is the best. Stick to the nonaggression axiom, and your political philosophy will generally be extremely sound.
Also, if you have not yet read it, look into Murray Rothbard's "For a New Liberty: The Libertarian Manifesto." It is the most astounding book on political philosophy I have read in my entire life.