Patent ID: 8776253
Filing Date: 2014-07-08
Classification: G06F

Abstract:
1. An authority changing device, in which a first authority is defined by a first combination that includes a first item value indicative of a role, a second item value indicative of an operation, and a third item value indicative of a geometrical relation, and a second authority is defined by a second combination of a fourth item value indicative of the role, a fifth item value indicative of the operation, and a sixth item value indicative of the geometrical relation, the device comprising: a logical expression storage configured to store therein a logical expression to indicate whether the change from the first authority to the second authority is possible, not possible, or unknown, based on the first item value, the second item value, the fourth item value, and the fifth item value; a table storage configured to store therein a first table that defines an availability of change of access authority from the first authority to the second authority, based on a pattern where the availability of change of access authority from the first authority to the second authority is unknown, and based on the third item value, and the sixth item value; a first determiner configured to use the logical expression so as to determine whether the change from the first authority to the second authority is possible, not possible, or unknown; a second determiner configured to, when the availability of change of access authority is determined to be unknown, use the first table so as to determine the availability of change from the first authority to the second authority; and a changing unit configured to, when the change from the first authority to the second authority is determined to be possible, change the first authority to the second authority.