One software license is required per machine.

Server - Chart FX for Reporting Services server components are licensed on a per-server basis for deployment, regardless of the number of processors (CPU's) in that server. The basic package includes one (1) Server License for deployment on a Production Server and one (1) Designer License.

Designer - Chart FX for Reporting Services design-time components are licensed on a per-developer basis. The license agreement permits you to use one (1) copy of these components on a single computer. If you need to install design-time components on more than one computer, you need to obtain an additional designer license for each computer.

Please read the License Agreement in the Documentation section to ensure you are licensed correctly.