초록 ▼

A system and method for updating old blank media onto which newer content is sought to be copied, to reduce the risk of unauthorized copying of new content onto old unupdated media. A computer system executes a method in which one or more calculate media key commands (CMKC) are written onto a blank

A system and method for updating old blank media onto which newer content is sought to be copied, to reduce the risk of unauthorized copying of new content onto old unupdated media. A computer system executes a method in which one or more calculate media key commands (CMKC) are written onto a blank recording medium, with the CMKCs defining an old media key. One or more CMKCs defining a new media key is associated with broadcast content, with the new CMKCs effectively revoking one or more device keys of a suspected pirate device. A legitimate player/recorder can decrypt the media keys from both the medium and the content, and then encrypt the content using the new media key and encrypt the first unconditional CMKC in the new CMKCs with the old media key. The encrypted content and the (now conditional) CMKC are recorded on the medium.

대표청구항 ▼

A system and method for updating old blank media onto which newer content is sought to be copied, to reduce the risk of unauthorized copying of new content onto old unupdated media. A computer system executes a method in which one or more calculate media key commands (CMKC) are written onto a blank

A system and method for updating old blank media onto which newer content is sought to be copied, to reduce the risk of unauthorized copying of new content onto old unupdated media. A computer system executes a method in which one or more calculate media key commands (CMKC) are written onto a blank recording medium, with the CMKCs defining an old media key. One or more CMKCs defining a new media key is associated with broadcast content, with the new CMKCs effectively revoking one or more device keys of a suspected pirate device. A legitimate player/recorder can decrypt the media keys from both the medium and the content, and then encrypt the content using the new media key and encrypt the first unconditional CMKC in the new CMKCs with the old media key. The encrypted content and the (now conditional) CMKC are recorded on the medium. d single or fused ring heterocyclic group, having aromatic character, containing from 5 to 12 ring atoms and comprising up to four hetero-atoms in the or each ring selected from S, O, N; in which inter alia, Ar is phenyl, optionally substituted by C1-6alkyl or halogen; thienyl or a C5-7cycloalkdienyl group; R is C1-6alkyl, C1-6alkoxycarbonyl, C1-6alkylcarbonyl or hydroxy C1-6alkyl; R1and R2are each hydrogen or C1-6alkyl; R3is hydrogen, hydroxy, halogen, C1-6alkoxy or C1-6alkyl; R4is hydrogen, C1-6alkyl, C1-6alkoxy, hydroxy, anino, halogen, aminoalkoxy, mono- or di-alkylaminoalkoxy, mono- or di-alkylaminoalkyl, phthaloylalkoxy, mono- or di-alkylaminoacylarnino or acylamino; R5is phenyl, thienyl, furyl, pyrryl or thiazolyl, and X is oxygen. X is O, S, or N--C≡N.