The limit of intellectual property protection is to effectively avoid monopoly and promote the development and progress of science and technology. For example, patents, if there is no time limit, all such patented products need to be paid to the patentee, and products improved on the basis of one product also need to be paid to the patentee, thus forming a monopoly, which is unreasonable and not conducive to technological progress. In China, different types of intellectual property rights have different protection periods. Works written by citizens shall be protected during the author's lifetime and 50 years after his death. The term of protection of a cooperative work shall be the author's life plus 50 years after his death, counting from the death of the last deceased author. Then, after creating their own works, citizens or enterprises can also apply to the judicial organs for intellectual property protection. After applying for intellectual property rights, no citizen or enterprise may infringe intellectual property rights.
legal ground
In Article 42 of the Patent Law of People's Republic of China (PRC), the patent right for invention is 20 years, the patent right for utility model is 10 year, and the patent right for design is 15 year, all of which are counted from the date of application.