Let's create a tool to help compare license compatibility for derviatives. Shouldn't be that hard now that all licenses has these metatdata tag on them. Only need a database with which licenses are compatible with which licenses (and versions) and a nice UI.
Proposed in #community-wishlist-survey-2016. Received 34 support votes, ranked #43 out of 265 proposals. [[ https://meta.wikimedia.org/wiki/2016_Community_Wishlist_Survey/Categories/Commons#CW2016-R044 | View full proposal with discussion and votes here ]].