Most Blue Sky source code is copyright The Regents of the University of
California.

Blue Sky as a whole may be distributed under the terms of the GNU
General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.
See the file COPYING.GPL2 for terms.

Many individual files are licensed under the terms of the BSD license;
see the copyright notices in individual source files.

Files which are not BSD-licensed include:
  bluesky/crc32c.c - Adapted from the Linux kernel, GPL v2-or-later
  kvstore/ - imported code for a storage backend, licensing not yet clear
  TBBT/ - imported benchmarking code, not covered by licensing above