I have SharePoint 2010 Foundation with a site collection for one business organization. Within that collection I have a lot of subsites. I would like to restrict members of one subsite from browsing user accounts in the people picker to only users within that subsite.
I have configured the option to only search within the site collection but need to increase that a level into the subsite.
I'm looking for suggestions on how to achieve this. Ideally I would like something that is low overhead. I looked at using AD read permissions to handle which accounts the logged in user is able to view but it was going to be a lot of overhead and complexity I would like to avoid.
Alternatively if there is a suggested way to remove/disable People picker from every possible area on the sub-site I would consider that as a solution.