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key2audio is a copy restriction system for Audio CDs, developed by Sony DADC.The system gained notoriety after it was discovered that one can effectively disable the system by tracing the outer edge of a CD with a felt-tip marker.
The letter invited hackers, cryptologists and others to detect and remove the watermark from some example pieces of music. Several groups became involved, including a group led by Ed Felten. Felten's group claimed to have cracked the scheme and successfully removed the watermark according to the automated judging software supplied by the SDMI.
Some audio/video editing programs may distort, delete, or otherwise interfere with watermarks. Signal/modulator-carrier chromatography may separate watermarks from the recording or detect them as glitches. Additionally, comparison of two separately obtained copies of audio using basic algorithms can reveal watermarks. [citation needed]
For various reasons, everyone likes to talk about the "analog hole" problem with DRM protection: pretty much all security falls down in the face of a well positioned camera and mic setup in the ...
An audio watermark is a unique electronic identifier embedded in an audio signal, typically used to identify ownership of copyright. It is similar to a watermark on a photograph. Digital watermarking is the process of embedding information into a signal (e.g. audio, video or pictures) in a way that is difficult to remove. If the signal is ...
Only a single channel of audio is required to detect the watermark. The watermark is able to survive re-recording through a microphone. The watermark can be detected through "the production, duplication, distribution, broadcast, and consumer handling of recorded content". [9] (In the white paper for their DVD-Audio Detector Compliance ...
The program supports burning data on CD-R, CD-RW, DVD-R, DVD-RW, DVD+R, DVD+RW, Blu-ray Disc and HD DVD as well as burning audio files (WAV, MP3, MP2, FLAC, Windows Media Audio, AIFF, BWF (Broadcast WAV), Opus, and Ogg Vorbis in the Red Book format. ISO images can also be burnt and created via the program, along with UDF and/or ISO-9660 formats ...
For example, audio tracks on such media cannot be easily added to a personal music collection on a computer's hard disk or a portable (non-CD) music player. Also, many ordinary CD audio players (e.g. in car radios) had problems playing copy-protected media, mostly because they used hardware and firmware components also used in CD-ROM drives ...
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