Programmable limited play video tape cassette

Claim 1

A limited play video tape cassette of the type including a cassette housing, supply and take up reels, and a video tape having prerecorded program information thereon including video signals for providing viewable and recognizable images when the tape is played and also having encrypted thereon a disruptive code which renders the images non-recognizable unless the disruptive code is removed prior to tape play, said limited play video tape cassette comprising: programmable control means for providing a play limit signal at the termination of a preselected and programmed play period; a decryption head, disposed in the cassette housing along the tape's path of travel from the supply reel to an opening in the cassette providing access for tape play, which is normally enabled for removing the disruptive code prior to tape play; an encryption head, disposed in the cassette housing along the tape's path of travel from the access opening to the take-up reel, for once again encrypting the tape with the disruptive code after tape play; and means, responsive to said play limit signal from said programmable control means, for inhibiting viewing of the video images in recognizable form, said inhibiting means including means for disabling said decryption head so that it does not remove the disruptive code thereby rendering the images non-recognizable when the tape is played.