I understand that Secondary Sites do not require a License. What Site Roles can a Secondary Site Server do without requiring a license?

Disclaimer: I don't do licensing. Never have. It's always been someone else's job to figure out licensing. Thank goodness. I can't think of a single reason that a Secondary Site would need a configmgr 2007 server license. You'll still need to cover the license for the OS itself I would assume. and if you happen to choose to have the server which is hosting the Secondary Site Role be a ConfigMgr client itself (you don't have to), then it would need to have a ConfigMgr Client license, just like every other client in your organization. If you install other things on there, like for design reasons you made that secondary site a proxy MP. and then for further design reasons, after carefully considering all of the available options, you decided that the proxy MP should use a SQL replica, then you'd need the sql license. But that's not a ConfigMgr license. But I digress. and I could be wrong. In general, in the forums is the absolute worst place to ask licensing questions. Every organization can have different licensing negotiated between their company and their Account Manager. Check with your internal licensing resources, and your account manager for whomever it is you purchase licensing from. Standardize. Simplify. Automate.