Abstract: A rotation device includes a rotator that includes a recessed portion formed on an outer circumferential surface and that rotates in a predetermined rotation direction; a contact unit that comes into contact with a portion of the outer circumferential surface in a range from an upstream end to a downstream end of the recessed portion in the rotation direction at a predetermined engagement depth; and a contact surface that is formed at an upstream end portion in the range in the rotation direction and that comes into contact with the contact unit at a second engagement depth less than a first engagement depth at a portion downstream of the upstream end portion.

Abstract: An operation terminal (120) requires an input of an authentication code when an authority granting request for corresponding electronic information to a tag (100) is received from a user, and transmits the authentication code to a server together with the authority granting request. The server (140) has an authentication code memory unit (142) that stores the authentication code for each tag, and an authorized user management unit (144) that manages the authorized user for each tag. In the case where an authority granting request and an authentication code are received from the operation terminal (120), the server (140) registers the user of the operation terminal (120) with the authorized user management unit (144) as an authorized user of the tag (100) under the conditions that an authorized user of the tag (100) is not registered with the authorized user management unit (144) and the received authentication code matches the contents of the authentication code memory unit (142).

Abstract: An operation terminal (120) requires an input of an authentication code when an authority granting request for corresponding electronic information to a tag (100) is received from a user, and transmits the authentication code to a server together with the authority granting request. The server (140) has an authentication code memory unit (142) that stores the authentication code for each tag, and an authorized user management unit (144) that manages the authorized user for each tag. In the case where an authority granting request and an authentication code are received from the operation terminal (120), the server (140) registers the user of the operation terminal (120) with the authorized user management unit (144) as an authorized user of the tag (100) under the conditions that an authorized user of the tag (100) is not registered with the authorized user management unit (144) and the received authentication code matches the contents of the authentication code memory unit (142).