vray watermark -- when using DR

hi there

I think that I know the answer, but not details … we have bought some licenses for our office in London and only one for Prague office, and was using DR heavily for long while , never notice this .. few weeks ago ( not upgradeing Vray , just somehow modifying license .. switch to NET one , I have found vray watermarks all over my visuals .. only when i use DR.. so I guess that there is some limit of used CPU and after that number in those buckets watermarks appears .. am I rights?

Question is how many CPUs can we use for ONE net license?

thx

viktor