The patent holder can write to the Spanish Patent and Trademark Office (SPTO) indicating that they are willing to authorise the invention to be used by anyone as a licensee.
These licences are called full licences and enable the holder to pay reduced annual fees, which are cut by half after this declaration has been received by the SPTO.
Anyone can use the invention legitimately as non-exclusive licence holder, so several full licences may exist for the same patent.
