1.3.4. 客户端凭据（1.3.4. Client Credentials）

当授权范围，限于客户端控制下的受保护资源或事先与 授权服务器商定的受保护资源时，客户端凭据，可以被用作为一种授权许可。典型的场景，当客户端代表自己的（功能角色acting）（时（acting on its own behalf）（客户端也是资源所有者）或者基于与授权服务器事先商定的授权请求对受保护资源的访问权限时，客户端凭据被用作为授权许可。

1.3.4. Client Credentials

   The client credentials (or other forms of client authentication) can
   be used as an authorization grant when the authorization scope is
   limited to the protected resources under the control of the client,
   or to protected resources previously arranged with the authorization
   server.  Client credentials are used as an authorization grant
   typically when the client is acting on its own behalf (the client is
   also the resource owner) or is requesting access to protected
   resources based on an authorization previously arranged with the
   authorization server.