Secure remote control communication systems
Method and apparatus for preparing recorded program material to prevent unauthorized duplication by magnetic tape recording
Copy-proof recording medium and device for adding copy-proof interference signal
Method and apparatus for modifying the color burst to prohibit videotape recording
Video system and method for controlled viewing and videotaping Patent #: 4945563
ApplicationNo. 544276 filed on 06/13/1990
US Classes:360/60, Recording-or erasing-prevention705/53, Including third party for collecting or distributing payment (e.g., clearinghouse)705/57Copy protection or prevention
ExaminersPrimary: Gregory, Bernarr E.
Attorney, Agent or Firm
Foreign Patent References
International ClassesG11B 023/36
Foreign Application Priority Data1987-07-08 JP
AbstractAn apparatus for the protection of signal copy for preventing unauthorized copying of music software such as records, compact discs and music tape by recording is arranged such that when recording audio signals on a medium, certain supplemental information is added to the audio signal to be recorded, and in the process of copying by reproducing this medium, when the supplemental signal is detected in the reproduced signal, the copying action is stopped to protect it from being copied.
Field of SearchRecording-or erasing-prevention