FYI:
The United States federal government maintains a set of evaluation criteria for judging the security of computer systems. Many of its agencies, and many private-sector companies, will only buy systems that meet specified sets of these evaluation criteria. The well-known “C2” rating of the US Trusted Computer Systems Evaluation Criteria (TCSEC) was one such level. The European counterpart to the TCSEC, the Information Technology Security Evaluation Criteria, specified a comparable rating. Both the US TCSEC and the European ITSEC have been updated. To reflect the increased sophistication of technologies and the growing need for more international standards for evaluation, a group of nations joined forces through the International Organization for Standardization (ISO) to design a new security evaluation process, known as the "Common Criteria for Information Technology Security Evaluation” (CCITSE).

While the Common Criteria was ratified as a standard in 1999, the stringent and lengthy testing requirements mean that test results for operating systems submitted for evaluation then are only now available. Testing for Microsoft® Windows 2000 was recently completed and as a result of these tests, Windows 2000 achieved (EAL 4 + Flaw Remediation). The certification of Windows 2000 covers the broadest set of real world scenarios and the highest level of evaluation yet achieved.

Napisao: Gule
Samo da pojasnim... moj komentar se odnosio na početak i sredinu devedesetih, kada je C2 bio jedna od glavnih prednosti Netwarea pred Windowsima.