This flag is used to mark pages that may potentially run afoul of the Copyright policy, which is a serious problem.
For example, it could be applied if the article contains contents from an external source but does not have the correct attribution or license set.
Manual of Style
TODO: Develop which section of Manual of Style this is related to.
If an article has this flag, understand and investigate the issues. Only if all copyright issues are resolved may you remove this flag.
If you check off this flag you must include a Template:Editorial/Copyright_Issue template in the body to give more details.