Policy
View menu: Disable Source menu option
Prevents users from viewing the HTML source of Web pages by clicking the Source command on the View menu. If you enable this policy, the Source command on the View menu will appear dimmed. If you disable this policy or do not configure it, then users can view the HTML source of Web pages from the browser View menu. Caution: This policy does not prevent users from viewing the HTML source of a Web page by right-clicking a Web page to open the shortcut menu, and then clicking View Source. To prevent users from viewing the HTML source of a Web page from the shortcut menu, set the "Turn off Shortcut Menu" policy, which disables the entire shortcut menu.
3183022fec0c View_NoViewSource Registry
Copy registry mappings
HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions\NoViewSource (enabled) = 1
HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions\NoViewSource (disabled) = 0Policy notes
Prevents users from viewing the HTML source of Web pages by clicking the Source command on the View menu. If you enable this policy, the Source command on the View menu will appear dimmed. If you disable this policy or do not configure it, then users can view the HTML source of Web pages from the browser View menu. Caution: This policy does not prevent users from viewing the HTML source of a Web page by right-clicking a Web page to open the shortcut menu, and then clicking View Source. To prevent users from viewing the HTML source of a Web page from the shortcut menu, set the "Turn off Shortcut Menu" policy, which disables the entire shortcut menu.