No, it's not lockable according to the ETK Preference Reference:
| ||
| Data type | boolean: DWORD value > REG_DWORD | |
| Default | 1 | |
| Version # | 8.0+ | |
| HKCU Path | Annots\cPrefs | |
| HKLM Path | Not lockable | |
| Summary | Uses the login names as the comment author name. | |
| Details | The login name is the name specified in the identity preferences panel. If it is not present, the login-name is used. If it is not present for comments in collaborative documents (shared-review, browser-based review, email based review), the comment author identity is used that the user has set. For Acrobat, the default is true; for Reader, it is false. Possible values include:
| |
| GUI mapping | Preferences > Commenting > Making Comments > Always use Log-in Name for Author name | |
