When
the latest version of a full pattern file is available for download
from the
Trend Micro ActiveUpdate
server, 14 "incremental patterns" also become available. Incremental
patterns are smaller versions of the full pattern file that account
for the difference between the latest and previous full pattern
file versions. For example, if the latest version is 175, incremental
pattern v_173.175 contains signatures in version 175 not found in
version 173 (version 173 is the previous full pattern version since
pattern numbers are released in increments of 2. Incremental pattern
v_171.175 contains signatures in version 175 not found in version
171.
To reduce network traffic generated when downloading the latest
pattern,
OfficeScan performs component
duplication, a component update method where the
OfficeScan server or Update Agent
downloads only incremental patterns. See
Update Agent Component Duplication for information on how Update Agents perform component duplication.
Component duplication applies to the following components: