We recently updated our list of various licenses and comments about them to include the Universal Permissive License (UPL). The UPL is a lax, non-copyleft license that is compatible with the GNU GPL. The UPL contains provisions dealing explicitly with the grant of patent licenses, whereas many other simple lax licenses only have an implicit grant. While making the grant perfectly clear is a reasonable goal, we still recommend using Apache 2.0 for simple programs that don't require copyleft. For more extensive programs, a copyleft license like the GNU GPL should be used to ensure that all users can enjoy software freedom.

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