That you so confidently brush off an argument by simply referring to an official government website is the logical fallacy known as "appeal to authority." Just because the government says that intellectual property as it currently exists is right and good does not make it the most beneficial or correct position.
Intellectual Property ultimately comes down to thoughts and ideas and the ability to express thoughts and ideas in the world.
I will refer you back to your same wikipedia entry on intellectual property: http://en.wikipedia.org/wiki/Intellectual_property
Please scroll down and read the section: criticisms. There are two sides to the argument. One that favors state control and monopoly, the other that favors human liberty and creativity.
If you would like to "do some homework" and really explore this issue I recommend reading "against intellectual monopoloy" by boldrin & levin and "against intellectual property" by kinsella
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