Symantec provides updates for the following types of definitions:
Definition files contain the necessary information to detect and eliminate risks, such as viruses and adware. Symantec supplies updated definition files every day and whenever a new risk is discovered.
You can update antivirus definitions using LiveUpdate, Rapid Release, or Intelligent Update.
Symantec periodically supplies updated URL definition files. If you subscribe to content updates, Symantec Protection Engine automatically downloads updated URL definitions through LiveUpdate. Symantec might create new URL categories to address emerging URLs as needed. If you subscribe to the content updates, any new categories are automatically downloaded with the regular updates to the existing categories.
You must update URL definitions using LiveUpdate.
Insight definition feeds are different in nature from that of AV definitions. Definition upgrade for Insight content are performed by APIs that add or remove the content information to the existing database and/or the reputation directory.
Rollback is not supported for any of the Insight specific content.
Symantec Protection Engine automatically uses the most current definition files for scanning. However, if a problem is discovered with the current definitions, you can revert (roll back) to the previous set of antivirus or URL definitions.
When you perform a content update, Symantec Protection Engine downloads and installs the most current definitions. If an error occurs, Symantec Protection Engine tries to roll back to the previous definitions. If the rollback is successful, Symantec Protection Engine continues scanning using the previous definitions. If the rollback is unsuccessful, scanning is disabled. You must have a valid license to update definitions.