[1] In 1998, a system called SiteShield eased the fears of theft and illicit re-use expressed by content providers who publish copyright-protected images on their websites.
[2] A research report published in November 2000 by IBM was one of the first to document a working system for web content protection, called WebGuard.
[3] Around 2002, several companies in the music recording industry had been issuing non-standard compact discs with deliberate errors burned into them, as copy protection measures.
[4] Google also notably installed an automated system to help detect and block YouTube video uploads with content that entail copyright infringement.
[5] However, as individuals and enterprises engaged in computer crime have become more skilled and sophisticated, they erode the effectiveness of established perimeter-based security controls.