Depending on how you activate a multi-year product license, the license duration can be reported to be less than you expect.
When you purchase a multi-year license, you receive a set of license files equal to the number of years your license is valid. For instance, a three-year license consists of three separate license files. When you activate a multi-year license, you import all of the license files during the same activation session. The Symantec Endpoint Protection Manager merges the separate license files into a single activated license that is valid for the purchased duration.
While not recommended, it is possible to activate fewer than the full complement of license files. In this case, the Symantec Endpoint Protection Manager merges the files and applies the duration of the license file that expires last. For instance, a three-year license that is activated with only the first two files indicates a duration of only two years. When the third file is activated at a later date, the full duration of the license is reported accurately as three years. In all cases, the number of seats remains consistent with the number of seats that you purchased.
Activate all of the license files to ensure correct reporting for your licensed installation.
Note: If you think a license has been inappropriately deleted by the Symantec Endpoint Protection Manager, you can recover it. For more information, see the topic, "Recovering a deleted license" in the Symantec Endpoint Protection and Symantec Network Access Implementation Guide.
You can also view the license serial numbers of shorter duration that are associated with the active license. On the Admin tab, click Licenses and then right-click the activated license and select Details.