Data Administration method

A data administration method, which comprises:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• preparing an annex data section in which use restriction information for restricting use of the digital content is encrypted;
• preparing composite data by compositing the real data section and the consent-information-added header data section, simultaneously compositing the annex data section;
• and
• distributing the composite data.

A data administration method, which comprises:

• separating an annex data section from composite data distributed as a composite of
• a real data section in which digital content to be distributed is encrypted,
• in a header data section enabling visual or auditory recognition of substance of the digital content, a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded as a visually or auditorily unrecognizable electronic watermark, and
• an annex data section in which use restriction information for restricting use of the digital content is encrypted;
• decrypting the annex data section and extracting the use restriction information;
• extracting the consent information embedded in the consent-information-added header data section based on the use restriction information;
• obtaining from the consent information a content key for decrypting the digital content;
• and
• using the content key, decrypting the real data section into its original digital content to allow use by users.

A data administration method characterized by:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• embedding in the header data section as a visually or auditorily unrecognizable electronic watermark a hash value generated from the real data section using a hash function;
• and thereafter
• preparing composite data in which the real data section and the consent-information-added header data section are composited, and distributing the composite data.

A data administration method characterized by:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• and
• decrypting the real data section into digital content for sending out, by line-connecting to a predetermined contact destination, content information from the digital content that is decrypted, and therein
• embedding in the header data section as a visually or auditorily unrecognizable electronic watermark the content information from the digital content that is decrypted and information on the predetermined contact destination;
• and thereafter
• preparing composite data in which the real data section and the consent-information-added header data section are composited, and distributing the composite data.

A data administration method characterized by:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• preparing composite data in which the real data section and the consent-information-added header data section are composited, and therein retaining within the composite data record-location information from a server in which the digital content is registered;
• and
• distributing the composite data.

A data administration method characterized by:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• and
• preparing composite data in which the real data section and the consent-information-added header data section are composited, and therein retaining within the composite data vital template information generated based on vital information on a user of the digital content;
• and
• distributing the composite data.

A data administration method characterized by:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content, and identifying information specific to a recording medium for recording the digital content, are embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• and
• preparing composite data in which the real data section and the consent-information-added header data section are composited, and distributing the composite data.

A data administration method characterized by:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content, and a control code allowing a given operation on an information device for reproducing the digital content, are embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• and
• preparing composite data in which the real data section and the consent-information-added header data section are composited, and distributing the composite data.

A data administration method, which comprises:

• preparing a real data section by encrypting digital content to be distributed;
• preparing a header data section enabling visual or auditory recognition of substance of the digital content;
• preparing a consent-information-added header data section in which consent information containing information on a content key used as an encryption key in encrypting the digital content is embedded in the header data section as a visually or auditorily unrecognizable electronic watermark;
• and
• preparing composite data by compositing the real data section and the consent-information-added header data section, and distributing the composite data;
• characterized in that
• privileges information for the digital content including copyright information is embedded within the digital content as an electronic watermark.