Inaudible audio tracking is IMO almost always against users informed consent, so apps doing it should be suspected as malware.
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Replying to @halvarflake
TVs & other devices that play audio should also be actively protecting privacy by filtering this content to prevent reception.
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Replying to @RichFelker @halvarflake
how can a TV filter hidden signal in audio? it's not like you need ultrasound/... to hide a message in sound
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slight pitch changes, ...
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I don't think the TV can really guard against this. but perhaps the TV stations could, by rejecting near-dupe ads
7:27 AM - 3 Dec 2016
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