A classification method and system for possible content alteration of a media work may include criteria regarding content that is feasible for alteration. Such criteria may be maintained in records that are accessible to an interested party. Some embodiments may include a record of primary authorization rights applicable to a possible content alteration. A further embodiment feature may include a record of secondary authorization rights applicable to substitute altered content incorporated in a derivative version. Various systems and methods may be used to incorporate substitute content in a derivative version of the media work in compliance with applicable modification guidelines. In some instances substitute promotional content may have some association with a real-world topic or real-world entity or real-world person.