Some products hide themselves better than others, though.
This page lists some of the ways you can tell what censorware is installed on your machine. When you try to access a blocked Web site, you don't get an actual message that says the site is blocked. Pages are displayed with individual words edited out. In versions 4.0 and later, when you attempt to access a blocked site, you will get a message that looks like this . In version 3.0, you get a dialog box that flashed on the screen instead, but it still mentions Cyber Patrol.