USB Redirector RDP edition (Workstation part) allows sharing USB devices without their number limitations. But the number of USB devices end user can use simultaneously on the Terminal Server computers (Terminal Server part) is defined by the license he purchased.

If you decided to use USB Redirector RDP for sharing your USB devices over RDP channel after your trial period is expired you need to purchase one of the following licenses. The licensing scheme depends on the number of Terminal Servers and on the number of remote USB devices that are used simultaneously on each Terminal Server.

For sharing USB device on workstation computer you can use FREE USB Redirector RDP edition (Workstation part)