Там очень старая версия.

https://github.com/bloomberg/comdb2/blob/master/berkdb/LICENSE

* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Redistributions in any form must be accompanied by information on
*    how to obtain complete source code for the DB software and any
*    accompanying software that uses the DB software.  The source code
*    must either be included in the distribution or be available for no
*    more than the cost of distribution plus a nominal fee, and must be
*    freely redistributable under reasonable conditions.  For an
*    executable file, complete source code means the source code for all
*    modules it contains.  It does not include source code for modules or
*    files that typically accompany the major components of the operating
*    system on which the executable file runs.