Are you talking about the license as in the legal document describing the licensing terms or the license as in the file that verifies the type of license you'd like to operate stardog under?
I'm not sure if it's contained in any of the artifacts but the legal document describing the licensing terms can be found the the distribution zip under docs/ in the files EVALUATION_LICENSE.txt and COMMUNITY_LICENSE.txt . You can try searching for those documents in the artifacts you've downloaded in your local maven repo.
As far as the operating license, that wouldn't be included in any artifacts and you'd have to use the license that was provided as part of your download after registering at
http://stardog.com or the license provided after purchase.
At least that's how I understand it.