Using RealVNC Viewer on my own Network.

Hi

  I am wondering IF I can use your RealVNC Viewer as my in house VNC client and connect to my ONE paid service VNC Server.  I never go outside or over the Internet or even need to.  They are all on an in house subnet and are on Raspberry PIs and a Laptop, all running Linux.  I can handle all the techy stuff just wondering if that breaches my contract with RealVNC, as I am the only user on all machines.  I understand that I could use another client viewer to my main server unit but I like using RealVNC Viewer.  I had a free service previously and could only justify a ONE Remote Service at RealVNC.

 I had this physical arrangement previously but just checking now that I can only have a single license.  Thanks for any advise ...

Robert