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audio-cassette copy-protection? | Tom's Guide Forum
https://forums.tomsguide.com/threads/audio-cassette-copy-protection.244845/
>because someone has attempted to copy the cassettes. I say this is >hogwash, as I am unaware of any schemes for copy-protecting audio >cassettes -especially that would destroy the source recording! There was a proposed (to the US Congress) cassette copy protection scheme that involved an in band signal and a cooperating recording deck.
Preservation Self-Assessment Program (PSAP) | Record ...
https://psap.library.illinois.edu/collection-id-guide/recordprotection
With MiniDV cassettes as well as Hi-8/DV-8 tapes (among others), the copy protection is a slide found on the tape. It is usually labeled. When the slide is …
US8160423B2 - Audio copy protection system - Google …
https://patents.google.com/patent/US8160423B2/en
An apparatus for applying an anti-copy protection signal for use with switchable head recorders, such as Video Hi-Fi recorders, is described. A high frequency pulsed signal is added to an original signal. The pulses interfere with the compensator circuitry such that the switching of the record head cannot adequately be masked on recording of a signal.
Cassettes - Tapes Archives - C64 Copy Protection
https://www.c64copyprotection.com/category/cassettes-tapes/
Cassette Copier. The TB-1 Data Cassette Copier, This will interface two data cassettes or Datasette to make back up copiers of your costly programs. 1. Can duplicate COPY PROTECTED programs (Did you know cassettes had copy protection?) 2. Copies Copies Machine Language programs without Vicmon 3. Copies several programs on one tape 4.
US20080089202A1 - Audio Copy Protection System - …
https://patents.google.com/patent/US20080089202A1/en
An apparatus for applying an anti-copy protection signal for use with switchable head recorders, such as Video Hi-Fi recorders, is described. A high frequency pulsed signal is added to an original signal. The pulses interfere with the compensator circuitry such that the switching of the record head cannot adequately be masked on recording of a signal.
Cassette copy protections - did they exist? - Page 2 ...
https://www.lemon64.com/forum/viewtopic.php?t=34185&start=15
Backing in topic, there was a copy protection which messed up the AGC (Automatic Gain Control) on tape duplicators. This protection introduced high peaks to trick the automated volume regulation system, which lowered the volume according to these peaks. Only Hi-Fi tape decks were able to manually adjust AGC levels.
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