Legal analysis: Intellectual property rights with indefinite protection period include: personal rights of works, patent rights of designs and rights of new plant varieties. According to the law, the protection period of the author's right of signature, modification and protection of the integrity of the work is not limited. However, the patent right for design shall be terminated from the date when the patent right is authorized and announced. If it is not terminated for other reasons, the patent right shall be terminated from the date when the patent right expires.
Legal basis: Intellectual Property Law of the People's Republic of China Article 1 This Law is formulated in accordance with the Constitution in order to protect the copyright of authors of literary, artistic and scientific works and their rights and interests related to copyright, encourage the creation and dissemination of works beneficial to the construction of socialist spiritual civilization and material civilization, and promote the development and prosperity of socialist culture and scientific undertakings.