To assign default permissions to pages in Typo3, the following TSConfig snippet is helpful:
TCEMAIN{ permissions.userid = 1 # Backend user with ID 1 permissions.groupid = 1 # Backend user group with ID 1 permissions.user = show, editcontent, edit, new, delete permissions.group = show, editcontent, edit, new, delete # no permissions for 'other' }
This code should be placed at Edit Page > Resources > TypoScript Configuration.
After saving the configuration, any new page below the edited page receives the configured default permissions.