SYSTEM AND METHOD FOR PREVENTING UNAUTHORIZED RECORDING, RETRANSMISSION AND MISUSE OF AUDIO AND VIDEO

摘要

In some embodiments, a method includes receiving, at a device, digital audio content to be converted by a digital-to-analog converter to produce analog audio content. The digital audio content has at least one audible frequency. The method also includes selecting, at the device, a first signal and a second signal to output with the analog audio content. The first signal has an inaudible carrier frequency and a bandwidth, and the second signal also has an inaudible carrier frequency and a bandwidth. A difference between the first signal and the second signal is an undesired audible signal. The method further includes outputting, from the device, the analog audio content, the first signal and the second signal, such that when the analog audio content is detected by a recording device the undesired audible signal is detected with the analog audio content.

主权项

1. A method, comprising:
receiving, at a device, digital audio content to be converted by a digital-to-analog converter to produce analog audio content, the digital audio content having at least one audible frequency, selecting, at the device, a first signal and a second signal to output with the analog audio content, the first signal having an inaudible carrier frequency and a bandwidth, the second signal having an inaudible carrier frequency and a bandwidth, a difference between the first signal and the second signal being an undesired audible signal; and outputting, from the device, (1) the analog audio content, (2) the first signal and (3) the second signal, such that when the analog audio content is detected by a recording device the undesired audible signal is detected with the analog audio content.