Apparatuses are classified into a plurality of categories, and based on a media key and device key data held by apparatuses belonging to the respective categories, revocation data intended for revoking the device key held by a specific apparatus of the respective categories is generated for the respective categories, and recorded on a recording medium.

 
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< Method for mapping an encrypted https network packet to a specific url name and other data without decryption outside of a secure web server

> Digital content encrypting apparatus and operating method thereof

> Method, apparatus, and system for outputting information and forming image via network, and computer product
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