What is "bitkeeper"

BitKeeper is a previously proprietary software tool for distributed revision control of computer source code, released under Apache 2.0 license on . BitKeeper is produced by BitMover Inc., a privately held company based in Los Gatos, California and owned by CEO Larry McVoy, who had previously designed TeamWare.

BitKeeper uses history files that are based on delta tables and interleaved deltas from Source Code Control System but uses an incompatible magic number (0x01 0x48 instead of 0x01 0x68) at the beginning.