The sources accompanying this notice -- sdbm -- constitute the first public release (Dec. 1990) of a complete clone of the Berkeley UN*X ndbm library. The sdbm library is meant to clone the proven functionality of ndbm as closely as possible, including a few improvements. It is practical, easy to understand, and compatible. The sdbm library is not derived from any licensed, proprietary or copyrighted software. The sdbm programming interface is totally compatible with ndbm and includes a slight improvement in database initialization. It is also expected to be binary-compatible under most UN*X versions that support the ndbm library.