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Buying and selling used video games has become a fact of life for many consumers -- but if game publishers get their way, it's about to become a lot more difficult. One 2009 estimate puts the size of the used game business at about $2 billion, representing about one-third of all annual game sales. That's a big deal, especially for market leader Gamestop, which is thought to get over 40% of its profits from reselling traded-in games. Major retail chains like Best Buy, Walmart, and Amazon have all dipped their toe in this lucrative market over the past year. But while it's a serious earner for retailers, it's a complete bust for game publishers, who make nothing from secondhand sales of video games. They're looking for ways to get a piece of the pie -- or, failing that, to take the pie away altogether. Here's a few of the tactics they're using to make buying and selling used games harder for consumers.