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In page X86:

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For some advanced features, x86 may require a license from Intel, though some do not need it;[citation needed] x86-64 may require an additional license from AMD. The Pentium Pro processor (and NetBurst) has been on the market for more than 21 years[8] and so cannot be subject to patent claims. The i686 subset of the x86 architecture is therefore fully open. The Opteron 1000 series processors have been on the market for more than 21 years[9] and so cannot be subject to patent claims. The AMD K8 subset of the x86 architecture is therefore fully open.