“The Tracking Protection Working Group is chartered to improve user privacy and user control by defining mechanisms for expressing user preferences around Web tracking and for blocking or allowing Web tracking elements. The group seeks to standardize the technology and meaning of Do Not Track, and of Tracking Selection Lists.” See in Input Documents as follows

• The FTC staff report that calls on industry to create a Do Not Track mechanism
• FTC guidelines for behavioral targeting
• IAB Self-Regulatory Principles for Online Behavioral Advertising
• Neelie Kroes, EU Commission, Online privacy – reinforcing trust and confidence
• Do Not Track Cookbook: approaches to data collection in DNT-friendly ways
• IETF proposal for Do Not Track
• Electronic Frontier Foundation (EFF) discussion of Do Not Track
• The Center for Democracy and Technology (CDT) DNT proposal
• Mozilla Do Not Track Field Guide
• Microsoft Web Tracking Protection, member submission to W3C