On this page about Sleepycat License:
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.
Software Foundation License Q Public License (QPL) Ricoh Source Code Public License Sleepycat License Sun...An open-source license is a copyright license for computer software that follows the principles of the open source movement. More formally, a license is considered open-source when it has approved by...