Normally the access control list of the latest checked in version of an object affects the permissions of the previous versions. A user is given certain permissions to the older objects only if those permissions are allowed by both access control lists: The one specified on the old version and the one specified on the latest checked in version.

This behavior can be overridden by making the access control list of the older version fully authoritative. This can be used to hide the latest checked in version while still leaving the old version visible to the users.

AccessControlList Collection  | AccessControlList Members