I recently had an idea how to access a lot more sources and perhaps even win some contributors over. The resources (artwork, textures, models, sound effects, music) there is on free and non-free archives is only a fraction of the resources there are to be found on the internet. There are lots and lots of 1. open source games and 2. even more free mods for existing games out there. The resources they use can most often not be found on free archives: E.g. we don't normally upload sounds, models or textures we do ourselves to some free archives either. (Ringwaul: or is it "neither"?)

In this topic, I would like to initiate a collection of some of these sources through mods for other games (or as well clonk mods for sounds) and check if the sources are compatible with our license for resources (any CC By).

Traditionally, mods for games take a lot of liberties with the copyright or ignore it completely and pretty blantly steal their resources together. Of course, we can't do that. So in case of doubt, we can always ask the mod author(s) if they are OK with putting their contributions under the CC by - everybody who invests his free time as a hobby to contribute to free (as in "free beer") projects will like to see his work being used further, too.
Open source projects are often under the GPL or other restrictive licenses. We can't use them by default either. But it could be that parts of the project (resources) are CC-by and again, in doubt we can ask the contributing authors to relicense (yes, its possible, but only for the copyright holder) their work under the CC-by. Again, I think they would be more than happy to see their work being used in other free projects, too.

I'll start:

http://forums.taleworlds.com/index.php#c5 - Mod development forum of a shareware game called "Mount&Blade". Useful for medieval (fight) sounds, some textures (weapons, armor, buildings). The licenses are unkown, probably a lot is used without right.

http://forums.civfanatics.com/forumdisplay.php?f=315 , http://forums.civfanatics.com/forumdisplay.php?f=158 - Mod development forums of Civilization 4 and Colonization. Licenses are unkown again. Could be useful for sounds (anything goes), models for living beings, some buildings (the polygon detail seems to be more or less the same as what we are aiming for), artwork

http://forums.wesnoth.org/viewforum.php?f=26 - possibly music and sound effects from "Battle of Wesnoth". It is a GPL-game, so the authors need to be asked directly if they want to relicense their work under the CC By