EP0756279A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Signal recording and reproduction and signal record media
Assignee: Sony Corp
•
Filing: 1996-07-17
•
Granted: —
•
Expires: 2016-07-17
Abstract
Abstract A signal reproducing apparatus, in which unauthorized decoding or copying is rendered difficult, reproduces enciphered data from a disk-shaped record medium (101) on which are recorded data enciphered by at least one encryption operation and key storage site information specifying an arraying site for at least one key information item used for deciphering the enciphered data. The apparatus includes a reproducing head device (212) for reading the enciphered data and the key storage site information from the record medium (101), a TOC decoder (219), a CPU (224) and a digital signal processing circuit (220) for decoding the enciphered data using the key information stored on the site designated in accordance with the key storage site information.
Inventors
- 👤 Yoshitomo c/o Sony Corp. Int.Prop.Dep. Osawa
- 👤 Yoichiro c/o Sony Corp. Int.Prop.Dep. Sako
- 👤 Akira c/o Sony Corp. Int.Prop.Dep. Kurihara
- 👤 Isao c/o Sony Corp. Int.Prop.Dep. Kawashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:03
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00086; G11B20/0021; G11B20/00137; G11B20/00188; G11B20/00217; G11B20/00246; G11B20/00253; G11B20/0026; G11B20/00282; G11B20/00297; G11B20/00318; G11B20/00347; G11B20/00485; G11B20/00492; G11B20/00507; G11B20/00572; G11B20/00586; G11B20/00876; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G06; G06F; G06F2211/00; G06F2211/007; G11B2220/00; G11B2220/20; G11B2220/23; G11B2220/235
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A signal recording apparatus for recording a ciphered signal on a signal record medium, comprising: at least one signal ciphering means for ciphering an input signal; and key storage site information entering means for entering the key storage site information specifying an arraying site for the encryption key information used in said at least one signal ciphering means.
Claim 2
Dependent Claim
28 words
The signal recording apparatus as claimed in claim 1 wherein the key storage site information is recorded in a particular user inaccessible portion on the signal record medium.
Claim 3
Dependent Claim
31 words
The signal recording apparatus as claimed in claim 1 wherein the key information is arrayed on the signal record medium or on sites other than those on the signal record medium.
Claim 4
Dependent Claim
50 words
The signal recording apparatus as claimed in claim 1 further comprising key information ciphering means for ciphering the key information and storage information specifying information entering means for entering the storage information specifying information specifying the arraying site of the encryption key information used in said key information ciphering means.
Claim 5
Dependent Claim
59 words
A signal record medium readable by a reproducing apparatus, said record medium having the a reproducing apparatus readable record signal thereon, the record signal including a ciphered signal obtained on performing at least one ciphering operation and the key storage site information specifying an arraying site of at least one key information item used for deciphering the ciphered signal.
Claim 6
Dependent Claim
26 words
The signal record medium as claimed in claim 5 wherein the site of recording of the key storage site information is a particular user inaccessible site.
Claim 7
Dependent Claim
34 words
The signal record medium as claimed in claim 5 wherein the key storage site information is ciphered and wherein the record signal further including the key information for ciphering the key storage site information.
Claim 8
Dependent Claim
94 words
A signal reproducing apparatus for reproducing a ciphered signal from a signal record medium having recorded thereon the ciphered signal obtained on performing at least one ciphering operation and the key storage site information specifying an arraying site for at least one key information item used for deciphering the ciphered signal, comprising: readout means for reading out the ciphered signal and the key storage site information from said signal record medium; and decoding means for deciphering the ciphered signal using the key information stored on the site specified by said key storage site information.
Claim 9
Dependent Claim
32 words
The signal reproducing apparatus as claimed in claim 8 wherein said readout means reads out the key storage site information recorded at a particular user inaccessible site on the signal record medium.
Claim 10
Dependent Claim
31 words
The signal reproducing apparatus as claimed in claim 8 further comprising take-out means for taking out the key information arrayed at a site other than sites on the signal record medium.
Claim 11
Dependent Claim
38 words
The signal reproducing apparatus as claimed in claim 8 wherein the key information is ciphered and wherein said readout means reads out the information specifying the arraying site for the key information used for ciphering the key information.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.