Licensing RDS 2008 R2 via SBS 2003

From looking around it looks like this isn't possible but I thought I'd see if someone can confirm for sure it won't.

I've been tasked with setting up RDS on a new 2008 R2 box we're going to be deploying along side an existing SBS 2003 machine. I've been asked to configure it in such a way that the licensing role isn't deployed on the 2008 R2 box but to configure the SBS 2003 to this.

So my question is: Can SBS 2003 handle licensing for a RDS deployment on 2008 R2?