Can an embedded public map be extracted from the page source code?


I am planning on embedding my map on various threads on a forum. The map will be set to public (viewing) and the forum threads which contain the embedded map will only be visible to members of a certain forum username group whose access to the embedded map threads can be controlled via the forum’s software. However, I would like to prevent anyone from viewing the map who is not a member of the forum.

If the map is set to public, could someone circumnavigate the forum software’s viewing restrictions by extracting a hidden link to the public map via the forum’s page source code?