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Page Restrictions cannot grant access or grant privileges a user does not already have from the Permissions on the wiki space.
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Think of your wiki as a house. Permissions are the key to getting into the house from the outside, they are the first level of security for the house. Restrictions are the key to individual rooms or sections of the house. You have to be able to get into the the wiki space/house with Permissions, before you even worry about the locks on rooms inside the house with Restrictions.
Generally you only need to use Restrictions if a page or a page and its children require a different set of security compared to the rest of the wiki space. For example, a wiki for a club may be set up in Permissions so all members can view and edit pages, but you might have a Leadership page with Restrictions on it so only members of the leadership team can view and edit that page and it's children.
- Vendor documentation on Page Restrictions: https://confluence.atlassian.com/conf613/page-restrictions-964960419.html
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