Apple has introduced a new anti-tracking policy in Safari, which will treat online web tracking as a security vulnerability. The policy aims to prevent all forms of covert tracking methods, and parties trying to circumvent it will be treated with the same seriousness as security vulnerabilities. This move is an extension of Apple's privacy-by-design paradigm, which started with Intelligent Tracking Protection (ITP) two years ago. The policy may have a significant impact on web publishing and advertising.