If you are researching this software for legacy or educational purposes, Kingsoft Internet Security 9 (KIS 9) was notable for being a lightweight, "cloud-based" security suite before that was an industry standard.
Searching for "serial numbers," "cracks," or "keygens" for security software is highly dangerous.
Many older Kingsoft security products were transitioned into the CM Security or Dubiba brands, making genuine keys for the "9 Plus" edition nearly impossible to find through official channels today.
: It integrated Kingsoft AntiVirus 9, AntiSpyware 9 Plus, and a personal firewall.
: Scans the operating system and applications for security holes, automatically downloading and applying patches. 百度百科 System & Utility Tools
Designed to be small in size so it does not slow down the PC. System Requirements and Compatibility