I went to correct Wikipedia, and found tht someone has been there before me. It now says, correctly, that "Drakar och Demoner" is based on BRP, and makes no mention of D&D.
Drakar och Demoner (Swedish for "Dragons and Demons") is a Swedish fantasy role-playing game first published in 1982 by the game publishing company Ã„ventyrsspel ("Adventure Games", later renamed to Target Games).
First edition was basically a translation of Steve Perrin's Basic Role-Playing (which in turn is based on RuneQuest) combined with the Magic World booklet. One of the available player races, the anthropomorphic ducks, was incorporated from Glorantha.
Second Edition was published in 1984, rewriting the text from scratch, fixing many translation errors and glitches in the rules although no other major changes were made.
The transition to a new system of rules began in 1985, not with Third Edition which mostly corrected spelling errors, but with the publication of an "Expert" rule expansion: Drakar och Demoner Expert. This among other things introduced hit locations and the use of a 20-sided die instead of the percentile die.
Fourth Edition in 1991 was a major revision of the rules, obsoleting Drakar och Demoner Expert by incorporating it into the basic rules and then expanding them.
In 1994, Target Games released Fifth Edition. This version was notable mainly because it came with an integrated world description. Changes to rules was minor, mostly reflecting the new campaign setting.
In the end of the 1990s, Target Games found itself in economic difficulties and ceased its publication of role-playing games. The rights to Drakar och Demoner was transferred to Paradox Entertainment and they in turn licensed them to the gaming company Riotminds. Riotminds created a brand new Drakar och Demoner in 2000. This Sixth Edition meant a complete overhaul of the game rules to support a much less generic game world. The idea of "Expert" rules was re-used, and many rules expansions followed.
In 2006, Riotminds consolidated the line with Seventh Edition, which like Sixth Edition before it, meant many rule changes to better support its chosen campaign world. This edition is the first boxed edition in many years.