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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 about 37 years as of 2026[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 equally been on the market for about 37 years as of 2026[9] and so also cannot be subject to patent claims. The AMD K8 subset of the x86 architecture is therefore fully open.