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One form of digital rights management (DRM) technology that may be used to protect the content of digital audio transmissions from unauthorized distribution and reproduction is the audio flag. The flag has two primary aspects: a physical component and rules and standards that define how devices communicate with flagged content transmitted from digital audio sources. For instance, a satellite digital audio radio stream of a particular broadcast music program could contain an audio flag (the mechanism) that prohibits any reproduction or further dissemination of the broadcast (the standard). The audio flag, according to its proponents, would operate in a similar manner as the video broadcast flag that has been proposed for digital television transmissions. Functionally, the audio flag system would work by embedding a special signal within transmitted digital audio data, informing the receiving device of certain copyright restrictions on the use of the content by the listener — for example, limiting the number of copies of a recording that the user may make.
Those advocating the use of an audio flag for digital radio programming include musicians, songwriters, record labels, and other providers of audio content that could be broadcast to the public through digital transmissions. The Copyright Act bestows several exclusive rights upon the creator of a work (or the individual having a legal interest in the work) that permit the copyright holder to control the use of the protected material. These statutory rights allow a copyright holder] to do or to authorize, among other things, reproducing the work, distributing copies or phonorecords of the work, and publicly performing the work.
Parties holding a copyright interest in content transmitted through digital radio services are interested in ensuring that such content is protected from unauthorized reproduction and distribution by the broadcast recipient; the audio flag, in their view, is an effective way to achieve this objective and enforce their rights. Proponents of audio flag technology also suggest that it would help prevent certain digital radio services (like satellite radio) from becoming a music download service through the creation of recording and storage devices that allow for further reproduction and distribution of audio broadcasts. Some copyright holders argue that these broadcasters must either pay additional royalties for the privilege of offering what appears to be a music download service, or comply with an audio flag regime that will effectively prevent broadcasters from allowing the recording in the first place.