One of the Symantec Encryption Desktop Consumer Policy settings in Symantec Encryption Management Server is the following:
Allow conventional encryption and self-decrypting archives
If users create Self-Decrypting archives, there is a risk that users may forget the password with no means of recovery and therefore some organizations will wish to disable this feature.
Although this policy prevents users from creating password-protected PGP Zip archives as intended, it does not prevent users from creating self-decrypting archives.
This issue is resolved in Symantec Encryption Desktop 10.3.2 MP12. Beginning with this release, when the Allow conventional encryption and self-decrypting archives policy is disabled, users cannot create either password protected or self-decrypting PGP Zip archives.
For more information on creating self-decrypting archives, see the following articles:
153684 - Creating a Self Decrypting Archive with PGP Encryption Desktop for Windows (Symantec Encryption Desktop)
153243 - Creating a Self Decrypting Archive with PGP Command Line (Self-Decrypting Archives - SDAs)