A patent gives the right to forbid a third party to make or use a patented product, to put it on the market or to stock it or to apply a patented process. Of course the owner of the patent (patentee) can also decide to allow a third party to work under the patent against compensation. This allowance can be given exclusively or non-exclusively. In case of an exclusive license only the licensee has the monopoly to use the invention (if there are no other prohibiting rights). In case of a non-exclusive license the licensor may also grant licenses to others.