USERS abuse of a dominant position is mainly based on two conditions: in the first place, USERS ability of restricting competition is attained through the illegal authorization by governmental departments or local authorities; in the second place, USERS is granted special or exclusive rights lawfully by government but abuses its dominant position.

Grid security is one of key issues in grid computing, while current research focus is put on the grid authorization.

Grid authorization is an action that gives access rights to legitimate users according to access control policy in order to ensure that different users with different identities have various service levels in a single domain or across multi domains.