Server device, method, and program

A method for causing a processor to execute a process, the method comprising executing on the processor in a computer the steps of:

• receiving at least one of person-under-restriction related information related to a person under restriction whose usage of a restricted item is restricted and usage related information related to usage of the restricted item by the person under restriction instructed by an instructor, the person-under-restriction related information being used to authenticate or identify the person under restriction;
• converting:
• two or more contents of the person-under-restriction related information;
• two or more contents of the usage related information;
• or
• one or more contents of the person-under-restriction related information and one or more contents of the usage related information,
• into converted information having two or more contents;
• and
• generating authentication key information by combining the two or more contents of the converted information, the authentication key information being used to authenticate input key information generated based on predetermined input-key generation rule information and the authentication key information and input to the restricted item by the person under restriction, and to release restriction of the restricted item.

A computer program product embodying computer readable instructions stored on a non-transitory computer-readable storage medium for causing a computer to execute a process by at least one processor so as to perform the steps of:

• receiving at least one of person-under-restriction related information related to a person under restriction whose usage of a restricted item is restricted and usage related information related to usage of the restricted item by the person under restriction instructed by an instructor, the person-under-restriction related information being used to authenticate or identify the person under restriction;
• converting:
• two or more contents of the person-under-restriction related information;
• two or more contents of the usage related information;
• or
• one or more contents of the person-under-restriction related information and one or more contents of the usage related information,
• into converted information having two or more contents;
• and
• generating authentication key information by combining the two or more contents of the converted information, the authentication key information being used to authenticate input key information generated based on predetermined input-key generation rule information and the authentication key information and input to the restricted item by the person under restriction, and to release restriction of the restricted item.