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The authentication server is to authentication as the ticket granting service is to Authorization.
Because In terms of general information security, computer security, and access control in particular, authorization is the process of defining access rights and privileges to resources. To "authorize" is to specify an access policy in a more formal sense. The primary cardholder is the individual who is the account owner for the credit card.
The account belongs to the primary cardholder, but authorized users may receive their own credit cards with their names on them. A server uses authorization to decide whether a client is allowed to access a file or use a resource. In order to give the server some idea of the identity of the client requesting access, authorization is frequently combined with authentication.
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