The summary of forum discussions on this subject is:
- Unfortunately, there are no layers here to give an exact and reliable advice.
- All Warzone 2100 files are under GPL v2+, which is a strong copyleft license. Using these files may allow your users to force you to release your whole product, including source code, under GPL.
- If you find releasing a GPL-licensed product a good idea, note that it is treated as a commercial activity (because GPL allows commercial use), so you can't use soft that you own under a "for non-commercial use only" license during development of your product.