ReportBuilder Professional and Enterprise Editions include the ability to build end-user reporting solutions that are royalty-free. The End-user reporting solution must be a part of a larger application and access a single database. For example, you cannot build a general purpose query or reporting tool and distribute that royalty-free. The license prohibits this type of solution.
ReportBuilder Server Edition currently includes a single developer license for ReportBuilder Enterprise and a single developer license to ReportBuilder Server. Also included is a Server Deployment License for a single CPU. This enables you to install a report server solution to a single CPU machine. Additional Server Deployment licenses are US $249.00 per CPU. Thus to deploy a server solution to a dual processor machine requires two deployment licenses. A report server can support as many clients as the hardware will allow. In summary, the licensing is per server CPU, not per client seat.