Can actors from Beijing People's Arts go out to film?

Don't go out to film for a year. According to the data of Beijing People's Art, Beijing People's Art Theater is a famous professional theater with unique performance style, which is the temple of China people's culture and art. Beijing People's Art was established in June, 1952. When he signed a contract with an actor, it was stipulated in the contract that after he entered the Beijing People's Art Theatre as an actor, he would not go out to film in other crews within one year, otherwise he would be punished by a large number of liquidated damages.