Some lawyers think the language used in the MIT license implies a patent grant limited to the use of the licensed software. They think it would be difficult for

Some lawyers think the language used in the MIT license implies a patent grant limited to the use of the licensed software. They think it would be difficult for the licensor to give a license on the software from one hand, and claim a patent infringement on the same software from the other hand, but as far as I know, this was never tested in court.