The <!--System:Copyright--> command just enters the "Part of the DKPSystem.com Network" notifier on your site.

So

<!--System:Copyright-->

Will convert to

Part of the <a href="http://www.dkpsystem.com" target=_blank>DKPSystem.com</a> Network.

If this command is not specified, it's automatically appended to your layout file.

Incoming Guide Links Layout File

Easy Link BBCode Link: [guide=--SystemCopyright--][/guide] URL: http://www.dkpsystem.com/guide/--SystemCopyright--

BBCode Guide