http://www.db4o.com/about/company/legalpolicies/gplfaq.aspx
When making my db4o-based application "open source" under the GPL, what are my obligations to publish the source code?
When you open source your application using db4o under the GPL, it is important that you make db4o and your derivative work - in source code - available to ALL db4o users, including the db4o Community who provided this product free of charge. It is not sufficient to publish your sources only to the users of your modified product. Your source code must be available to all users in the db4o community.
Это действительно соответствует GPL? Я считал, что существует обязанность предоставлять исходный код только пользователям.