In Korea, either non-exclusive or exclusive licenses may take effect contractually between the parties without registration. However, if the exclusive licensee wishes to create a right that can directly exercise its right to exclude a 3rd party from practicing the licensed patent, registration is necessary. Further, in either case of non-exclusive or exclusive licenses, a registered right of the licensee is honored in the event that the licensed patent is assigned to a 3rd party, but unregistered right of the licensee does not have such an effect.
Registration does not ensure that a licensor's bankruptcy administrator will not decline to perform obligations under a license agreement or revoke a license agreement under applicable law of bankruptcy. However, assuming that the administrator does not decline the license obligations or revoke the license agreement, registration will be beneficial if the licensed patents are transferred to a 3rd-party purchaser in connection with the licensor's bankruptcy. In other words, if the license is registered, the purchaser cannot acquire the patents free of the license.
A 3rd-party purchaser will acquire a patent free of any existing license unless the license is registered. In contrast, if the license is registered, the license is enforceable to a 3rd-party purchaser in the way that the 3rd-party purchaser acquires the patent subject to the pre-existing license.
The above applies to trademarks, utility models, designs and registered copyrights.