There are plenty of examples of this, look at some of the software that is open source but have sales around them. nginx, redhat, surgarcrm etc. There really

There are plenty of examples of this, look at some of the software that is open source but have sales around them. nginx, redhat, surgarcrm etc. There really are a lot of examples. Once you find a few, look at the different license types they use, GPL has different versions that allow for different things, MIT is probably the most permissive and probably wouldn't be the choice given the description you gave. Then of course, you can always have a license written that fits your specific requirements.