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It's called "plugging the analog hole," preventing people from making unauthorized recordings by controlling every part of the playback technology. While it's t
by extra88 10y ago
It's called "plugging the analog hole," preventing people from making unauthorized recordings by controlling every part of the playback technology. While it's true purchased iTunes songs have been DRM-free for many years, subscription models have become the music listening mode of the moment and copyright holders don't want people making recordings then canceling their subscription.
I suppose another opportunity would be to block playback on louder hardware, "Public performance playback is available with a 'Pro' subscription."
- revelation 10y agoBut plugging the analog hole on audio, stereo even, is impossible. The only reason HDCP was even a remotely plausible idea is that it's very difficult to capture 1080p 30fps from say the column drivers of a LCD. Capturing a 44kHz audio signal by snipping the lead off the loudspeaker and putting it into your recorder is very, very trivial. As far as RF engineers are concerned that's pretty much DC.