EUPL - strong copyleft license outside EU

Open Weaver is a private body led by experts with global technology and multi-industry experience and backed by private investors. It has offices in the US and India, and not in the European Union so far.

This make absolutely no obstacle for adopting the EUPL for licensing components of its flagship product KANDI (pronounced kan·dee), which is a platform that helps developers pick the right library, package, code samples, APIs, and cloud functions, by analysing over 430 million knowledge items.

In particular, the Virtual-Learning-Lab (C# library) is an open-source virtual reality game designed to mimic physical school/courses as best as possible, with the added benefits of virtual reality. The target is to make online school even better then real life school.

Concerning licensing, Open Weaver makes the following comments:

• Virtual-Learning-Lab is licensed under the EUPL-1.2 License. This license is Strong Copyleft.
• Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

This assessment is right, provide you are able to make a distinction between the various flavours of the “Strong Copyleft” understanding. According to the GPL/AGPL licensor vision, this means some restrictions and conditions regarding interoperability (due to the famous FSF theory that linking other software with their covered code creates a combined derivative) and regarding compatibility (since no derivative could be licensed under another license, which creates incompatibilities).
According to the EUPL vision regulated by the EU law, this is all the contrary: linking makes no derivatives and when merging source code licensed differently is a real necessity, the resulting derivative can be licensed under a compatible license.
These compatible licenses are listed in the EUPL appendix and for some of them like the MPL, the copyleft is known to be “weaker”, but this has no impact because according to the EUPL the applied compatible license will only prevail when its provisions conflict with those of the EUPL. And since none of the compatible license prohibits the strong reciprocity implemented by the EUPL (obligation to publish and share the source code of derivatives, even distributed through a network) the copyleft resulting from the EUPL is indeed strong.  

An additional evidence that the EUPL, which is used by companies all over the world, is not a “territorial” license, but is selected for its original (and unique, so far) vision of copyleft.

For more information:

https://kandi.openweaver.com/csharp/Virtual-Learning-Lab/Virtual-Learning-Lab