A method for blocking content from being presented at a client device including substitution of alternative content. The client device recognizes and evaluates the received tags and blocks content based on a user profile. Substitute content is then identified and presented to the user. Substitute content includes a blank screen, prestored contents, a screen saver, alternative server content, and user selected content. The user may be prompted prior to substitution or choose that substitute content be automatically presented without prompting. Audio may be presented while substitute video is presented.