Office SharePoint Server 2007 provides the ability to manage permissions on the following objects:
List items within lists
List items within libraries
You might have sensitive information stored in a particular securable object. A securable object might be a list, library, folder within a list or library, document, or list item. If you do not want to expose the information to all users of a site, you can restrict some users and SharePoint groups from accessing a particular securable object.
Any users with the Manage Permissions permission on a particular securable object can manage permissions on that particular securable object.
By default, Site Owners have the Manage Permissions permission. Any user with the Full Control permission on a particular securable object can also manage permissions on that securable object.
To manage permissions for a document library, you can perform the following procedures, which are on Office Online, in no particular order.
Membership in the Administrators group is the minimum required to complete these procedures.