hmm it seems there is an odd behaviour when we set a page on cascading protection.
the main article that getting the protection is fine. ordinary user still can press EDIT and view the content. but NOT saving.
the descendant (the sub pages) have a weird behaviour. when click EDIT, it show a login page ??? and user cannot see the content of the article to be use for copy - pasting.
i have a temporary solution when dealing with that kind of page, which involve typing the address manually to edit.... but i just wondering if this behaviour intentionally ?