Solo licenses are for single developers working on products making less than $20k USD per year gross. Solo licenses are provided as a cost-effective way to allow single developers to get started using Nova.
Pro licenses are for multiple developers working on products making more than $20k USD per year gross. Pro licenses also receive email support. This is primarily targeted towards business customers.
Sry, but I asked something else. I have read faq also, but usage of single license for the same product, on multiple links and servers is still unclear to me.
Can I use one Nova license for all my sites?
Every project you use Nova for must have its own license. There are no "Unlimited Sites" licenses for Nova at this time.
What is a considered a "project"?
A project is a single installed instance of Nova. You may use Nova on local, sandbox/staging servers as well as one production environment. You may use Nova on multiple subdomains as long as they're served from the same instance of Nova. You may not use a single Nova license for multi-tenant websites where there's multiple copies of Nova running. Each of those are considered separate projects and require their own license.
I don't understand what that "same instance of Nova" means.