ISC.org: BIND 9.1.0 releasedJan 18, 2001, 22:12 (0 Talkback[s])
"BIND version 9 is a major rewrite of nearly all aspects of the underlying BIND architecture...."
"Compared to BIND 9.0, BIND 9.1 has a number of new features as well as numerous bug fixes and cleanups."
"BIND 9.1.0 also includes experimental implementations of a number of DNS protocols extensions still under development in the IETF. These include transparent processing of unknown RR types and use of the EDNS "DNSSEC OK" bit to explicitly enable DNSSEC processing in responses."
"Cryptographic operations are now based on the OpenSSL library instead of DNSsafe."