The British Board of Film Classification (BBFC) is a non-governmental organization founded in 1912 that is responsible for classifying and censoring films shown in the UK. The BBFC considers factors like discrimination, drugs, horror, imitable behavior, language, nudity, sex, themes, and violence when determining what age group a film is appropriate for. They assign ratings from U through 18R. For the film "Immunity," the document's author concluded a 15 rating was appropriate due to its mild use of horror, violence, and themes of death and terror, without containing discrimination, drugs, nudity, or inappropriate language.