Here you can find the Spine Runtime License Agreement: https://en.esotericsoftware.com/spine-runtimes-license
If you are an SDK/library developer and don’t want to have a Spine license, the important part to analyze is this one:
Otherwise, it is permitted to integrate the Spine Runtimes into software or otherwise create derivative works of the Spine Runtimes (collectively, "Products"), provided that each user of the Products must obtain their own Spine Editor license and redistribution of the Products in any form must include this license and copyright notice.
This means that you can integrate the Spine Runtimes into your library under these two conditions:
- Each user of the Products must obtain their own Spine Editor license → the users of your library must have a license.
- Redistribution of the Products in any form must include this license and copyright notice → your library must include this license and copyright notice.
Point 2 is pretty simple: add the LICENSE file to your library.
For Point 1, just make sure it’s clear to your users that using your library requires a Spine license.
In any case, take into account that we are in the process of releasing 4.3 and it might requires a lot of effort to port to 4.3 your bindings.
