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DSA 4 ("Das Schwarze Auge", in English known as "The Dark Eye") is a roleplay system from Germany owned by Ulissess Spiele GmbH. This is a legacy edition making an old FG version compatible with FGU.
A much more advanced DSA free ruleset can be downloaded at www.drachenzwinge.de but showing the respective thread in their forum as well es downloading the ruleset there requires you to register with their forum. I hope Drachenzwinge will make their version of the ruleset available via the Forge soon.