Trend Micro Virus Pattern File is a collection of Virus Pattern files updated from the latest identified virus databases for Trend Micro anti-malware products, which can help users update the pattern file manually in case the Security Server is not connected to the Internet or some agents are not connected to the Server.
Users can update server or agent components by using either Official Pattern Releases (OPRs) or Controlled Pattern Releases (CPRs). The difference between the two is that, while OPRs are thoroughly tested to provide optimum protection to the end users, the CPR is a pre-release that aims to provide users with additional protection in between official ones.
Updating the pattern file of a security server can be done by extracting the contents of the pattern archive into the PCCSRV directory of the security server, which will automatically deploy the updated content to the connected agents after a short while.
Security agents can be updated manually by logging into them with Administrator rights, shutting down their specific services (unloading the Security Agent completely has the same effect), extracting the contents of the pattern file archive to the Security Agent folder inside the client directory and restarting the services previously shut down or reloading the agent. It’s crucial to keep virus definitions up to date, in order to protect computer systems from the newest malware threats.