The Official Pattern Release or OPR is Trend Micro's latest compilation of patterns for identified viruses. It is guaranteed to have passed a series of critical tests to ensure that customers get optimum protection from the latest virus threats.
Trend Micro offers various types of Pattern Files to protect customers from Malware, Spyware/Grayware, and other threats.
Virus Pattern Files / Cleanup Templates
Spyware Pattern Files / Cleanup Templates
Spyware Pattern Files for the new SSAPI Anti-Spyware Engine
Network Virus Pattern
Vulnerability Assessment Pattern
Trend Micro Mobile Security Patterns
Consumer Virus Pattern File
Wireless Pattern

The license of this software is Update, you can free download and free use this antivirus update software.