Broadcast flag refers to a copy prevention method for digital television programming.
The essence of the FCC's rule is in 47 CFR 73.9002(b) and the following sections: "No party shall sell or distribute in interstate commerce a Covered Demodulator Product that does not comply with the Demodulator Compliance Requirements and Demodulator Robustness Requirements."
The Demodulator Compliance Requirements insist that all HDTV demodulators must listen for the flag (or assume it to be present in all signals). Flagged content must be output only to "protected outputs" or in degraded form: through analog outputs or digital outputs with visual resolution of 720x480 pixels or less--less than 1/4 of HDTV's capability. Flagged content may be recorded only by "Authorized" methods, which may include tethering of recordings to a single device.
The Demodulator Robustness Requirements are particularly troubling for open-source developers. In order to prevent users from gaining access to the full digital signal, the FCC ties the hands of even sophisticated users and developers. Devices must be "robust" against user access or modifications that permit access to the full digital stream. Since open-source drivers are by design user-modifiable, a PC TV tuner card with open-source drivers would not be "robust". It's not even clear that binary-only drivers would qualify.
Together, these rules mean that future personal video recorder developers will have to get permission from the FCC and/or Hollywood before building high-definition versions of the TiVo. The products that they do build will be epoxied against user experimentation and future improvement. The rules mean that open-source developers and hobbyists will be shut out of the HDTV loop altogether. [1]
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