I've read this question: How do I value a private company's market cap?
Assume: "market cap" = outstanding shares * price per share.
Right now, I'm trying to outline a license for some software I've created. What I'd like to do is tier based pricing, where the tiers are defined by market caps. The license will be on the honor system. I don't need to be able to check the companies market cap, but I do need them to be able to figure it out.
How difficult is it for a private company to compute their own market cap?
What sort of blockers or hurdles are there in which a company would be unable to estimate this number?