Content Security 6.1 for Microsoft ISA or Forefront TMG Servers 2004 / 2006 / 2010 is based on extremely complex yet fast content filtering kernel called ai.Strings. The kernel utilizes scientifically invented string search algorithms resulting in an incredibly fast and effective substring search. This allows Content Security 6.1 for Microsoft ISA or Forefront TMG Servers 2004 / 2006 / 2010 to process large volumes of web traffic according to collection of content filtering settings and rules at relatively small amount of time, bringing more functionality and convenience to the users of application.