The title is pretty self explanatory. I have a stack on one of my page-types that I don't want a certain user (my client) to be able to edit or add new things.

I've went into page-types -> mypage -> defaults and set the permission for that particular stack and particular user all unchecked except "Read". I publish the changes but the user can still edit/delete/move etc the stack.

Another problem is that I can't set the defaults page-type permission for the "Add to xxx" also, just like the stacks.

Among the things I've tried:
- Edit the stack's permission from the dashboard/admin panel.
- Edit permissions for each individual block within the stack
- Used the "Set up on child pages".

If I edit the permissions on that particular stack, but on single pages (not defaults), the permissions update and work properly, but only for that page and not for the already created pages or the newly created pages.

The thing is I can manually update existing pages one by one, but when the client adds a new page, it will have the page-type default permissions which will enable him to mess everything up.

I don't know what to do and it's really important. I hope someone can help me.

Thank you in advance.