Memory device, host device, and memory system

A host device comprising:

• a storage section configured to store time limit information and a content with a time limit for use;
• a charge section configured to have a function of charging a battery section furnished in a connected device;
• and
• a control section configured to have a function of determining whether or not to transmit the time-limited content based on said time limit information and on received information about an expected time period during which said battery section can sustain a counting operation of said connected device;
• wherein said control section transmits said content if said expected time period is determined to be longer than said time limit on said content.

A memory system comprising:

• a host device;
• and
• a memory device configured to be communicable with said host device;
• said host device including
• a first storage section configured to store time limit information and a content with a time limit for use,
• a charge section configured to have a function of charging a battery section furnished in said memory device, and
• a first control section configured to have a function of determining whether or not to transmit the time-limited content based on said time limit information and on information about an expected time period during which said battery section can sustain a counting operation of said memory device,
• said first control section transmits said content if said expected time period is determined to be longer than said time limit on said content,
• said memory device including
• a second storage section configured to store a content with a time limit for use,
• an elapsed time counting section configured to count said time limit,
• a battery section configured to be supplied with power from said charge section of said host device accessing the time-limited content so as to be charged with power for operating said elapsed time counting section, and
• a second control section configured to include a function of determining said expected time period during which said battery section can sustain said elapsed time counting section operating to count said time limit.

A memory device comprising:

• storage means for storing a content with a time limit for use;
• elapsed time counting means for counting said time limit;
• battery means for being supplied with power from an external device accessing the time-limited content so as to be charged with power for operating said elapsed time counting means;
• and
• control means for including a function of determining an expected time period during which said battery means can sustain said elapsed time counting means operating to count said time limit.

A host device comprising:

• storage means for storing time limit information and a content with a time limit for use;
• charge means for having a function of charging a battery means furnished in a connected device;
• and
• control means for having a function of determining whether or not to transmit the time-limited content based on said time limit information and on received information about an expected time period during which said battery means can sustain a counting operation of said connected device;
• wherein said control means transmits said content if said expected time period is determined to be longer than said time limit on said content.