Re: "I don't know for sure. But IMHO a burn rate = expenses that you have no matter whether there are revs to offset. Like explained below."
You seem to be refering to "fixed" versus "variable" expenses. Fixed refers to things that are always there: rent, insurance, ... Variable refers to things that are not constant: sales commisions, labor hours, ...
Burn rate may have more than one definition, but the intent of the original question seems to raise a valid concern.
How long, without more license sales, will PTSC's Cash and other liquid assets last?