Spymarks, Not Watermarks

Spymarks, a type of invisible tracking technology, have been found to be embedded in several popular web fonts. These spymarks can be used to track users' online activities and are often used in web fonts to identify which websites a user has visited. The technology is not a watermark, but rather a tracking mechanism that can be used to build profiles of users' browsing habits. Spymarks can be used to track users even when they have enabled their browser's tracking protection, and can also be used to track users across multiple devices and platforms. Several popular web fonts have been found to contain spymarks, including Arial, Times New Roman, and Verdana.