Vulnerability Management, Detection, and Response (VMDR) is a cornerstone product of the Qualys TruRisk Platform and a global leader in the enterprise-grade vulnerability management (VM) vendor space. With VMDR, enterprises are empowered with visibility and insight into cyber risk exposure - making it easy to prioritize vulnerabilities, assets, or groups of assets based on business risk. Security teams can take action to mitigate risk, helping the business measure their actual risk...
I don't have any details about the licensing process.
Qualys Virtual Scanner Appliance isn't expensive right now. But the price for their product bundles could be better.