Assignment The assignment of IPRs in Greece should be in writing and, in the case of registrable IPRs, recorded with the competent IPR office, otherwise they remain un-opposable to third parties.
Licensing The licensing of IPRs (including applications) requires a written agreement.
For trademarks, such license agreement should be recorded with the Greek TM Registry.
For patents, utility models and industrial design license, the recordal of licenses is only of probative nature.
Non-contractual patent licenses may be granted, under certain circumstances, without prior consent of the patentee, for non-exploited patents, following third-party application.