摘要:
An apparatus comprising a transmission system for transmitting an information signal, and a reception system including an information receiving unit for receiving the information signal, and an information recording/reproducing unit for recording/reproducing the received information signal on/from a recording medium. The reception system includes a specific information storage circuit for storing specific information which is assigned peculiarly to the reception system in advance, a specific information donating circuit for adding the specific information to the received information signal or encrypting the received information signal on the basis of the specific information to supply the resulting information signal to the information recording/reproducing unit, and a specific information judgement circuit for receiving an information signal reproduced by the information recording/reproducing unit and verifying the information signal with a condition based on the specific information stored in the specific information storage circuit so that when the condition is satisfied, a signal obtained by deleting the specific information added to the reproduced information signal or by decrypting the encrypted information signal is outputted.
摘要:
A digital signal recording and reproducing method and apparatus using first, second, third, and fourth information as information to protect a copyright, the first and second information are added to the digital signal, the third information is inputted from the digital interface together with the digital signal, a value of the fourth information is decided from a combination of the first to third information, and the fourth information is recorded onto the recording medium. The first information is information to control a copy restriction of the digital signal, the second information is information to perform a control about whether the signal is protected against the illegal use or not, the third information is information to indicate whether the signal has been encrypted or not, and the fourth information is information to control the copy restriction of the digital signal recorded on the recording medium.
摘要:
Encrypting/decrypting conversion method and apparatus capable of controlling dynamically cyclic shift independent of data to undergo encrypting/decrypting conversion includes two or more different fixed circulating shift processing means for shifting cyclically the data by a fixed bit number leftward or rightward, a cyclic shift processing selecting means for selecting fixed cyclic shift processing means. The selecting sequence determined by the cyclic shift processing means is determined on the basis of data for determining the shift number selecting sequence.
摘要:
A digital information recording apparatus to record digital information to protect copyright of digital information that includes at least first digital information and first copy control information. The digital information recording apparatus records the digital information based upon the first copy control information, which denotes one of: a copy inhibition prohibiting copying of said first digital information; a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and an unlimited copy permission authorizing unlimited copying of said first digital information.
摘要:
A method is disclosed wherein a first piece of digital information and copy control information of the first piece of digital information is received. The copy control information is for controlling the recording of the first piece of digital information on a recording medium. When the received copy control information is Copy One Generation indicating that only one generation copy of digital information is allowed, then a plurality of the first pieces of digital information are recorded on a first recording medium as the first piece of digital information and a second piece of digital information, wherein the first piece of digital information is different in format or in bit rate from the second piece of digital information.
摘要:
If content is transmitted/received through a digital signal bus, protection of copyright causes a problem because of no deterioration in quality. Accordingly, authentication is required. The quantity of information to be processed is, however, so large that a long time is required for authentication. Accordingly, both achievement of handling property as in conventional analog connection and protection of copyrighted content without user's awareness become an object. The foregoing object can be achieved by authentication which is executed, for management of copyright, among apparatuses connected to the digital signal bus when the apparatuses are powered on or connected to the digital signal bus or when an input terminal connected to the digital signal bus is selected. The object can be further achieved by an encryption key shared among these apparatuses.
摘要:
A digital signal recording apparatus is disclosed, which is capable of protecting the copyright of the analog input information encoded into a first digital signal in a recording medium. A second digital signal encrypted based on the key information and the input analog signal encrypted based on the key information are converted into a second digital signal and encrypted, and the resulting signal is selectively recorded in a recording medium. The digital signal recording apparatus further comprises a circuit for encrypting the digital signal converted from the input analog signal with a key obtained by a predetermined calculation of the key information according to a scheme similar to the second digital signal protection scheme through a digital interface, and a signal recording circuit for recording the key information and the encrypted digital signal in a recording medium.
摘要:
A digital signal recording apparatus is disclosed, which is capable of protecting the copyright of the analog input information encoded into a first digital signal in a recording medium. A second digital signal encrypted based on the key information and the input analog signal encrypted based on the key information are converted into a second digital signal and encrypted, and the resulting signal is selectively recorded in a recording medium. The digital signal recording apparatus further comprises a circuit for encrypting the digital signal converted from the input analog signal with a key obtained by a predetermined calculation of the key information according to a scheme similar to the second digital signal protection scheme through a digital interface, and a signal recording circuit for recording the key information and the encrypted digital signal in a recording medium.
摘要:
If content is transmitted/received through a digital signal bus, protection of copyright causes a problem because of no deterioration in quality. Accordingly, authentication is required. The quantity of information to be processed is, however, so large that a long time is required for authentication. Accordingly, both achievement of handling property as in conventional analog connection and protection of copyrighted content without user's awareness become an object. The foregoing object can be achieved by authentication which is executed, for management of copyright, among apparatuses connected to the digital signal bus when the apparatuses are powered on or connected to the digital signal bus or when an input terminal connected to the digital signal bus is selected. The object can be further achieved by an encryption key shared among these apparatuses.
摘要:
If content is transmitted/received through a digital signal bus, protection of copyright causes a problem because of no deterioration in quality. Accordingly, authentication is required. The quantity of information to be processed is, however, so large that a long time is required for authentication. Accordingly, both achievement of handling property as in conventional analog connection and protection of copyrighted content without user's awareness become an object. The foregoing object can be achieved by authentication which is executed, for management of copyright, among apparatuses connected to the digital signal bus when the apparatuses are powered on or connected to the digital signal bus or when an input terminal connected to the digital signal bus is selected. The object can be further achieved by an encryption key shared among these apparatuses.