We've recently had a couple of discussions about the plans of various game developers to fight used game sales — in particular, the idea of a free, one-time download that may be bonus content or may be a vital part of the game. Now, Soren Johnson, a game designer who has worked on Civilization 3, Civilization 4 and Spore, has written an article defending certain aspects of the used game market. Quoting: "By opening up retail sales to a larger segment of the market, used game sales mean that more people are playing our games than would be in a world without them. Beyond the obvious advantages of bigger community sizes and word-of-mouth sales, a larger player base can benefit game developers who are ready to earn secondary income from their games. In-game ads are one source of this additional revenue, but the best scenario is downloadable content. A used copy of Rock Band may go through several owners, but each one of them may give Harmonix money for their own personal rights to 'Baba O'Riley' or 'I Fought the Law.'"