Versant Inc. offers three difference license options for the db4o object database engine db4o:
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:
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.
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.When you download the db4o distribution, you receive the following 3rd party libraries:
http://mono-project.com/Cecil Mono.Cecil (MIT/X11)
Used inside Db4objects.Db4o.Instrumentation.dll and Db4oTool.exe
Cecil is used to read the CIL code during native queries optimization.
http://mono-project.com/Cecil .FlowAnalysis (MIT/X11)
Used inside db4o support libraries and Db4oTool.exe
Cecil.FlowAnalysis is used to analyse the CIL code during native queries optimization.
http://mono-project.com/ Mono.GetOptions (MIT/X11)
Used inside Db4oTool.exe
Mono.GetOptions is used to parse the command line of the Db4oTool.exe tool.
These products are not part of db4o's licensed core offer and for development purposes. You receive and license those products directly from their respective owners.