Popular culture does not follow any one system of ideas, customs, philosophy, religion, or morality. Some of its forms include grammar, language, or pictures that are not accepted under a society's customs. For this reason a society or government may not approve of popular culture. If a government thinks that any form of it may harm people or cause society to change in a bad way, the government may ban it. This practice is known as censorship. In some countries popular culture is protected under freedom of speech or other rights. 