Intellectual property is a good example of the contradictions of capitalism. It destroys the principles of freedom, but in truth is necessary to perpetuate the capitalist system.

As for that being my opinion, it isn't. Capitalism has never been about maximizing individual freedom.

The foundational act of capitalism was the Enclosure Act. How does the Enclosure Act increase individual freedom? It doesn't.

You're conflating a specific subset of negative freedoms for human freedom in general. Which itself was a post-hoc justification for capitalism.

As for freedom of information being a capitalist ideal, why then is it that institutions like state secrets, patent law, copyright law and so on were created under capitalism? You claim that it is controversial, so why is there no capitalist country that doesn't have it? And why was it specifically lobbied for by early capitalists and created with capitalist?

This is just a nice fantasy that was established after capitalism already started. The very birth of capitalism, the Enclosure Act, was to restrict freedom to increase profit.

In fact, the original libertarians and anarchists were a movement that sought to end capitalism, precisely because of its coercion.

> Intellectual property is a good example of the contradictions of capitalism. It destroys the principles of freedom, but in truth is necessary to perpetuate the capitalist system.

Your assertion is quite wrong and far-fetched. Intellectual property is not necessary to "perpetuate the capitalist system", at all, and asserting otherwise has no bearing in reality. Your right to private property and to own means of production does not depend in any way on the state being able to stop others from copying concepts or ideas.

Which actual real capitalist economy has survived without intellectual property?

Without the enclosure of the intellect, capitalism is unable to effectively organize research and development, leading to its failure.