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.
This pattern file is most impactful when used with the latest scan engine. We powerfully encourage you to update your scan engine to ensure you are using the best virus protection available. For latest viruses added, please read the whatsnew.txt file.

MD5 checksum: e8cb1bf4a2df1d2f0650ff870c1c53b5

The Official Pattern Release or OPR is Trend Micros latest compilation of patterns for identified viruses.
Trend Micro offers various types of Pattern Files to protect customers from Malware, Spyware/Grayware, and other threats...
It is guaranteed to have passed a series of critical tests to ensure that customers get optimum protection from the latest virus threats.
Use this version of the pattern file for all Trend Micro products running on Intel or DEC Alpha based operating systems and for products using Trends virus scanning API Library.
Because more than 200 new viruses are discovered every month, it is powerfully suggested that you update your virus pattern files regularly.
This pattern file is most impactful when used with the latest scan engine. We powerfully encourage you to update your scan engine to ensure you are using the best virus protection available.

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