A method of recording and reproducing video signals which include video information and copy protection information for restricting the number of times the video information may be copied. Original video information is recorded onto a recording medium with updated copy protection information that indicates...http://www.google.de/patents/US5907657?utm_source=gb-gplus-sharePatent US5907657 - Video recording, transmitting and reproducing with concurrent recording and transmitting or multiple dubbing of copy protected video signals
