David White wrote: > Thank you for raising these points. > > I think that we should require add-ons also use CC-BY-SA 4.0 for art and > music, the same as the game.
While this seems like a simple solution from an administrative point of view, I guess this will result in lots of content on the add-on-server (a) dissappearing, or (b) being wrongly labeled. Much stuff there is frankensteined from other stuff which was originally released by GPL (or at least assumed to be released as GPL implicitly due to its appearance on the add-on-server or in mainline), or made by request on the forums. I guess in many cases it is impossible to hunt down the copyright holders (i.e. authors) of any piece of art (e.g. a sprite), to get their approval – and for a change of license you need the approval of all the authors. In such a case an add-on maintainer only can decide to remove the piece of art (resulting maybe in some bad replacement, or a broken add-on), not upload the add-on again, or pretend to have the necessary rights/approvals for such a change, and mislabel it as CC-BY-SA. (Which could possibly result in lawsuits from one of the original copyright holders due to license violations.) All this is assuming the add-on maintainer even cares about the legalese, and not just uploads whatever they find somewhere without checking anything. (The same problem occurs for mainline, but I guess there we can have someone systematically checking each piece of art (at least we have version control here, which should hopefully contain author names in commit messages), hunt down their authors, and get their permissions, or schedule a replacement creation for each piece of art where this doesn't succeed. This still will take some time.) Also, you would either have to delete everything currently on the add-on server (or move into some backup place), or somehow label each add-on for art license. Maybe it would be easier to switch at some point when a new (empty) add-on server for a new version is introduced – stuff uploaded to the new server must adhere to the new rules, why stuff on the old server still can be GPL only. Another question: What about written art (i.e. dialogue, story texts, unit descriptions, etc.)? I guess this is usually quite intertwined with the (WML) code, and might better have the same license. But what if someone wants to write a book based on a campaign, using the dialogue? Does the book then have to be released as GPL? Paul (I only contributed some minor fixes to some Python tool years ago, so I'm not personally affected by this.)
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