As you may know, the Centre for Technology and Publishing at Birkbeck publishes and maintains a piece of open-source software for journal publishing called Janeway(https://github.com/BirkbeckCTP/janeway/). This software is licensed under the AGPLv3. We chose this license for several reasons, but the most important was that we wanted strong CopyLeft protection, including for server-side usage, on this software.
Martin Paul Eve (Tue,) studied this question.