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TABLE 1: NCSC Security Ratings |
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| Rating Code | Rating Name |
| A1 | Verified Design |
| B3 | Security Domains |
| B2 | Structured Protection |
| B1 | Labeled Security Protection |
| C2 | Controlled Access Protection (Windows NT 3.5 earned this rating) |
| C1 | Discretionary Access Protection (this rating is obsolete) |
| D | Minimal Protection |