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AssigneeSony Corporation
InventorsYoichiro Sako, Isao Kawashima, Akira Kurihara, Yoshitomo Osawa, Hideo Owa
Estimating the term…
A data reproducing apparatus and method is provided for reproducing data that was ciphered during recording in one or more of sector forming, header appending, error correction coding, modulation, and synchronization appending operations used for processing input data to form a recording signal. Thus, deciphering requires knowledge of both the ciphering key and the aspect(s) of the recording operation in which the ciphering took place. The deciphering may also include a descrambling operation in which an initial value and/or a generating polynomial is varied in accordance with ciphering key information.
A data reproducing method comprising;
A data reproducing apparatus comprising;
A data reproducing method comprising the steps of:
A data reproducing method comprising the steps of:
A data reproducing method comprising the steps of:
A data reproducing method comprising the steps of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Circuits for prevention of unauthorised reproduction or copying, e.g. piracy: involving encryption or decryption of contents recorded on or…
Signal processing not specific to the method of recording or reproducing; Circuits therefor: circuits for prevention of unauthorised reproduction…
Involving measures which result in a restriction to authorised record carriers: wherein the record carrier stores a unique medium identifier
Involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier: using a device…
Term ended 14 Sep 2018 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to a data recording method and apparatus, a data record medium and a data reproducing method and apparatus applicable to prevention of copying or inhibition of unauthorized use and to a charging system.
Recently, with increased capacity and coming into widespread use of a digital record (recording, recordable or recorded) medium, increasing importance is attached to prevention of copying or inhibition of unauthorized use. That is, since digital audio data or digital video data can be duplicated free of deterioration by copying or dubbing, while computer data an be easily copied to produce the same data as the original data, unauthorized copying is made frequently.
For avoiding unauthorized copying of the digital audio or video data, there is known a standard such as a so-called serial copying management system (SCMS) or copy generation management system (CGMS). Since these systems set a copying inhibition flag on a specified portion of record data, a problem is raised that data can be extracted by dump copying which is the copying of a digital bi-level signal in its entirety.
FIG. 1 is a schematic block diagram showing the configuration of a first embodiment of a data recording apparatus of the present invention.
FIG. 2 is a block diagram showing an illustrative construction for realizing interleaving of even and odd bytes in a sector forming circuit.
FIG. 3 illustrates interleaving of even and odd bytes.
Referring to the drawings, preferred embodiments of the present invention will be explained in detail.
FIG. 1 schematically shows a first embodiment of the present invention.
In FIG. 1, digital data, such as data obtained on digital conversion of analog audio or video signals or computer data, are fed to an input terminal 11. The input digital data is sent via an interfacing circuit 12 to a sector forming circuit 13 so as to be formed into sectors in terms of a pre-set data volume, such as 2048 bytes, as a unit. The data thus formed into sectors is sent to a scrambling circuit 14 for scrambling. For scrambling, the input data is randomized so that the same byte pattern will not be produced in succession, that is so that the same patterns will be eliminated, by way of randomizing, for enabling the signal to be read and recorded appropriately. The scrambled or randomized data is sent to a header appendage circuit 15 where header data to be arrayed at the leading end of each sector is appended and the resulting data is sent to an error correction encodina circuit 16. The error correction encoding circuit 16 delays the data and generates parity to append the generated parity. The next circuit, that is a modulation circuit 17, converts the 8-bit data into 16 channel-bit modulated data in accordance with a pre-set modulation rule and sends the resulting modulated data to a synchronization appendage circuit 18. The synchronization appendage circuit 28 appends a synchronization signal violating the modulation rule of the above pre-set modulation system, that is a so-called out-of-rule pattern synchronization signal, in terms of a pre-set data volume asa unit, and sends the resulting synchronization signal via a driving circuit, that is a driver 19, to a record head 20. The record head 20 performs optical or magneto-optical recording and records the modulated signal on the record medium. The disc-shaped record medium 21 is run in rotation by a spindle motor 22.