| 摘要 |
IC card ( 300 ) supplies an encryption key which enables content use, to a terminal apparatus ( 200 ) belonging to a domain made up of terminal apparatuses ( 200 ) which share the IC card ( 300 ). The IC card ( 300 ) includes: an extra-domain usage rule holding unit ( 305 ) which stores a rule for use of the IC card ( 300 ) in a terminal apparatus ( 200 ) which is outside of the domain; and an extra-domain use permission judgment unit ( 309 ) which judges, according to the usage rule, whether or not use of the IC card ( 300 ) is permitted, when the IC card ( 300 ) is provided to the terminal apparatus ( 200 ). The IC card ( 300 ), in addition, supplies the encryption key to the terminal apparatus ( 200 ) which is outside of the domain, when the extra-domain use permission judgment unit ( 309 ) judges that use is permitted.
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