A permission set determines who can access a particular item in a repository. Each item in the repository has an associated permission set, determining who can access the item and what actions each user with access can perform. Your access to a repository item is determined by the permission set assigned to the item.
A permission set lists the users and groups who have access. The permission set assigns one of the following seven access levels to each user and group listed. Each access level includes all the permissions of the preceding levels:
None: No access to the item.
Browse: Users can view the item’s properties (but not its content).
Read: Users can view the item’s content.
Relate: Users can annotate the item.
Version: Users can modify and check in new versions of the item.
Write: Users can modify and check in the item as the same version.
Delete: Users can delete items.