DIGITAL INFORMATION PROTECTION METHOD AND ITS PROCESSOR

Japanese Patent JP3276021

B2

PURPOSE: To provide the digital information protection method and its processor which protect information from the wrong action like wrong copy or alteration of data after reception.
CONSTITUTION: Digital information including the information main body enciphered by a common key and use condition information is received through a communication control part 2 and is stored in a digital information storage part, and use condition information is stored in a use condition information storage part 41 in a security processing part 4. The common key is preliminarily stored in a common key storage part 32, and alteration verification of digital information inputted from the digital information storage part 3 to the security processing part 4 is performed by a verification part 43. The common key is used to decipher the digital information inputted to the security processing part 4 by a deciphering part 44 based an the verification result. Further, deciphered digital information is converted to analog information by an analog conversion part 45 and is outputted. Thus, the rights and profits of a writer and an information presenter are protected.

Yoshiyoshi Yamanaka
Ikuro Oyaizu
Katsuhiro Tanabe

JP27538893A

April 22, 2002

November 04, 1993

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Nippon Telegraph and Telephone Corporation

G06F21/10; G06F9/06; G06F12/14; G06F21/12; G06F21/60; G06F21/62; G06F21/64; G09C1/00; G10K15/02; H04L9/06; H04L9/08; H04L9/14; H04L9/32; (IPC1-7): H04L9/08; G06F9/06; G09C1/00

JP4155658A
JP4320181A

山中喜義，高嶋洋一，小柳津育郎，マルチメディアオンデマンドサービスにおける情報保護システム，ＮＴＴ Ｒ＆Ｄ，日本，１９９５年９月１０日，Ｖｏｌ．４４，Ｎｏ．９，ｐｐ．８１３−８１８
山田学，新ＤＡＴのディジタルコピーの原理，エレクトロニクスライフ，日本，１９９０年１０月１日，１０月号６９８号，ｐ．５０−５７

Seiko Yoshida

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