Microsoft is proposing a new Internet-wide security model that is designed to address the problem of how to prevent infected machines from affecting the security and performance of PCs elsewhere on the Web. The model would require each PC to present a health certificate that outlines its security posture before it could connect to the Internet. The centerpiece of the plan is the concept of a health certificate, an attestation that a given PC would need to provide to an ISP or other authority. The certificate could include data on the overall health of the machine, such as infections by known malware and antimalware software are installed.
Source: https://threatpost.com/microsoft-proposes-health-certificates-internet-access-100510/74547/