!!! Overview
[{$pagename}] ([CCG]) (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 [OAuth Client], or to protected resources previously arranged with the [Authorization Server].  



[OAuth 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].

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [RFC 6749 Client Credentials|https://tools.ietf.org/html/rfc6749#section-1.3.4|target='_blank'] - based on data observed:2015-05-18