The Common Criteria Evaluation and Validation Scheme (CCEVS) is a form of software accreditation that focuses on software security.
You can view the results for the Windows 7 accreditation at [1]. The website also has comprehensive documentation on the methodology used to accredit the software (including visibility of the source code).
You can view the results for the Windows 7 accreditation at [1]. The website also has comprehensive documentation on the methodology used to accredit the software (including visibility of the source code).
[1] http://www.niap-ccevs.org/st/vid10390/