Sleepycat License

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The Sleepycat Public License is an OSI-approved open-source license used by Sleepycat Software for their products Berkeley DB, Berkeley DB Java Edition and Berkeley DB XML.

According to the Free Software Foundation,^[1] it qualifies as a free software license, and is compatible with the GNU General Public License.

The license is a strong form of copyleft because it mandates that redistributions in any form not only include the source code of Berkeley DB, but also "any accompanying software that uses the DB software." As an alternative to this strict licensing policy, Berkeley DB is also licensed under the Sleepycat Commercial License that does not require redistribution of accompanying software.