"Screen photography" refers to the behavior of the audience using mobile phones and other devices to shoot movie pictures on the big screen during the cinema viewing. The film side has issued a statement calling for "a joint boycott of pirated recording and piracy" There is no clear legal prohibition on taking only a single photo, but it is also an unethical act and is not advocated.
At a time when casual sharing of life is prevalent, "screen photography" may be regarded as a memorial to lost youth.