First, when determining the object of copyright, the works are classified according to different media; Two, when determining the ownership of copyright, according to the creation or publication of the work; Third, when determining the master-slave status of copyright, according to whether there is a derivative relationship between the work and other works, the works are divided into original works and deductive works. Four, when determining the scope of restricting copyright, according to whether the work is open or not, the work is divided into published works and unpublished works.
Legal objectivity:
Article 28 of the Patent Law of People's Republic of China (PRC) The date when the patent administrative department of the State Council receives the patent application documents shall be the filing date. If the application documents are mailed, the postmark date of mailing shall be the application date.