The version of NSS included in Sun Java System Web Server 6.1 SP5 has been upgraded from 3.9.5 (in version 6.1 SP4) to 3.10.1.0 (32-bit) and 3.11 (64-bit). NSS is a set of libraries designed to support cross-platform development of security-enabled server applications. Sun Java System Web Server 6.1 SP5 also includes NSPR 4.5.2.