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to create, it is possible to have a patent on an idea but still be unable to legally implement it if the invention relies on another patented idea. Thus, open-source patent grants can offer permission only from covered patents. They cannot guarantee that a third party has not patented any concepts embodied in the code. The older permissive licenses do not discuss patents directly and offer only implicit patent grants in their offers to use or sell covered material. Newer copyleft licenses and the 2004 Apache

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