As Second Life matures, they are taking some fairly customary steps, one of which is to take a more proactive role to protect their own intellectual property. In this vein, Linden Labs has created the Second Life Brand Center, which details the proper and improper use of Linden Labs trademarks. In addition, Linden Labs has created the “inSL” mark for users to use under certain conditions to signify their presence in Second Life. The Brand Center is online here.

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U.S. Patent: 6,264,560 - USPTO grants re-exam request