License

Licensing the db4o Engine

db4objects Inc. offers three difference license options for the db4o object database engine db4o:

General Public License (GPL) Version 2

db4o is free under the GPL, where it can be used:

You receive a copy of the GPL in the file db4o.license.txt together with the db4o distribution.

If you have questions whether the GPL is the right license for you, please read:

Commercial License

For incorporation into own commercial products and for use together with redistributed software that is not placed under the GPL, db4o is also available under a commercial license.

Visit the commercial information on db4o website for licensing terms and pricing.

db4o Opensource Compatibility License (dOCL)

The db4o Opensource Compatibility License (dOCL) is designed for free/open source projects that want to embed db4o but do not want to (or are not able to) license their derivative work under the GPL in its entirety. This initiative aims to proliferate db4o into many more open source projects by providing compatibility for projects licensed under Apache, LGPL, BSD, EPL, and others, as required by our users.

The terms of this license are available here: "dOCL" agreement.

3rd Party Licenses

When you download the db4o distribution, you receive the following 3rd party libraries:

In java versions

  • Apache Ant(Apache Software License)

    Files: lib/ant.jar, lib/ant.license.txt

    Ant can be used as a make tool for class file based optimization of native queries at compile time.

    This product includes software developed by the Apache Software Foundation(http://www.apache.org/).

  • BLOAT(GNU LGPL)

    Files: lib/bloat-1.0.jar, lib/bloat.license.txt

    Bloat is used for bytecode analysis during native queries optimization. It needs to be on the classpath during runtime at load time or query execution time for just-in-time optimization. Preoptimized class files are not dependent on BLOAT at runtime.

These products are not part of db4o's licensed core offer and for development purposes.  You receive and licese those products directly from their respective owners.