According to The New York Times:
Lee Tien, a senior attorney with the Electronic Frontier Foundation, [says] a "do not track" system most likely would be built into a Web browser or function as a plug-in. It would send a signal telling a website and the content providers and advertisers that the user did not want to be tracked.
Congress is also gearing up to address the issue, The Washington Post reports. The House Subcommittee for Commerce, Trade and Consumer Protection will hear testimony regarding the Do Not Track requirement as part of a hearing on a broader Internet privacy bill being proposed by Rep. Bobby Rush, D-Ill, who chairs the subcommittee. The hearing has been tentatively set for Dec. 2.
Writer Cecilia Kang explains:
The bill ... will spell out what information cannot be collected by Web sites and third-party advertisers without approval by users.
Internet companies like Google say implementing the technology law would be too complex to be feasible. Marketers also hate the idea, according to The New York Times. Mike Zaneis, a vice president at the Interactive Advertising Bureau, said:
You simply can't just turn off tracking. That's the way interconnected systems talk to each other.