| 摘要 |
<p>Means are provided for secure transmission of motion picture information, video programming information, and other video information, as well as still pictures. The invention makes it difficult to obtain an illicit copy of data by borrowing or stealing a print or the digital equivalent from a motion picture theater, or to make illicit copies from the same. A data transmission is encrypted and electronically delivered to the intended recipient. A decryption key is stored on a physical storage medium, delivered to the intended recipient, and used thereafter to decrypt the encrypted data transmission. In one embodiment, a motion picture is transmitted to a theater via a communication link each time it is shown, at the time it is shown, so that a copy never sits in the theater. The invention further prevents the production of illicit copies of copyrighted material captured by videotaping or filming a moving screen in a movie theather. Variations which are reproduced by image capturing devices are introduced into a moving image, which prevent the generation of a viewing-quality copy by such devices.</p> |
