[ubuntu] Why is Comodo anti-virus linux version not in Ubuntu software center?

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http://ubuntuforums.org – The debain package "cav-linux_1.1.268025-1_i386.deb" can be downlowded from the Comodo anti-virus website http://antivirus.comodo.com/ . The package can be opened with Ubuntu software center but can not be searched for using it. It also can not be uninstalled using the Ubuntu software center. To uninstall programs not in the Ubuntu software center you must use the command line such as sudo apt-get --purge remove package. There are also other great programs not found in the Ubuntu software center such as the Amaya web design tool. What is the reason that these programs can not be sear (Hardware)