Abstract: Mechanisms for restricting playback functionality of a media device in response to detecting unauthorized content are provided, the mechanisms being configured to: determine whether a piece of media content on a media device is unauthorized content known to be obtained through an authorized channel; and in response to determining that the piece of media content is unauthorized content: cause the media device to present a warning to a user to remove the unauthorized content; and change a setting on the media device by sending instructions to a hardware processor of the media device so that decryption of an authenticity token is inhibited for all media content on the media device, wherein the media content on the media device includes a plurality of pieces of media content.