Symantec Encryption Products have two produce lines, Symantec Encryption Desktop 10, and Symantec Endpoint Encryption 11.
Symantec Encryption Desktop does not currently support preboot customization for UEFI systems, but can be used for Legacy BIOS\MBR.
A Feature Request has been submitted for UEFI customization of the Preboot images for Symantec Encryption Desktop.
Symantec Corporation is committed to product quality and satisfied customers. Support has worked directly with Product Management and starting with Symantec Endpoint Encryption 11.1.3, customizing the preboot screen is now supported. . To download this version, visit Fileconnect.
Symantec Encryption Desktop does not include this functionality. To have your organization added to the list of companies that desire this Feature Request, please contact technical support.
For information on how to create customized XPM images, see the following articles: