In addition to censoring films that are considered a threat to China's security, censors will also stop films whose actions "do not uphold China's sovereignty", writes the BBC.
- This will have an immediate effect.
Hong Kong's film industry has already begun to self-censor, but what we will see now is that the supply and production of films is expected to decrease drastically, says Johan Nylander, a journalist who lives in Hong Kong with China as its coverage area.
In mainland China, all films go through harsh censorship and only a few Western films are released in cinemas each year.
However, Hong Kong has historically had greater freedom, leading to a strong film industry.
Famous films produced in Hong Kong include Ang Lee's Crouching tiger hidden dragon, Wong Kar-wais In the mood for love and not least a long line of kung fu films with Bruce Lee, such as Way of the dragon.
Background
Between 1842 and 1997, Hong Kong was a British colony.
In 1997, the British returned Hong Kong to China and the "one country, two systems" system was introduced.
This meant that Hong Kong would enjoy freedoms not found in mainland China.
Hong Kong also has its own parliament.
According to the agreement, the system will apply until the year 2047, but China has taken a number of measures to restrict Hong Kong's autonomy.
2019 In April 2019, a bill that would expand the possibilities of extraditing criminal suspects from Hong Kong to China led to extensive demonstrations.
In March this year, Beijing hammered out a new electoral system that reduces Hong Kong's power over the region.
See Johan Nylander tell more about Hong Kong's film industry in the clip.