Did we have to buy Licences?

Hello everybody,
we want to use virtualhere in our network. We have some rasperry Pi's and are running xfreerdp on it. On 3 off the raspberry's we have to install a virtual here server for local printers. Per server there is only one member(client) and one usb port used. Did we have to buy 3licences because we are a company or can we use it for free?
Thank you best wishes.
Martin

#2

No need to purchase if you only want to use one device, and dont resell virtualhere on your own device.