Do I have to pay a license fee for Berkeley DB?
http://www.oracle.com/technetwork/database/berkeleydb/downloads/licensing-098979.html

Our open source license permits you to use Berkeley DB, Berkeley DB Java Edition or Berkeley DB XML at no charge under the condition that if you use the software in an application you redistribute, the complete source code for your application must be available and freely redistributable under reasonable conditions. If you do not want to release the source code for your application, you may purchase a license from Oracle. For pricing information, or if you have further questions on licensing, please contact us at berkeleydb-info_us@oracle.com.