В Office 2003 есть IRM (Information Rights Management). В Excel меню File/Permission/Restrict permission as...
Вот выдержка из справки:
F1
Access levels
Users or groups can be given a set of permissions according to the access levels assigned to them by authors using the Permission dialog box:


Read Users with Read access can read a document, workbook, or presentation, but they don't have permission to edit, print , or copy.
Change Users with Change access can read, edit, and save changes to a document, workbook, or presentation, but they don't have permission to print .
Full Control Users with Full Control access have full authoring permissions and can do anything with the document, workbook, or presentation that an author can do: set expiration dates for content, prevent printing, and give permissions to users. Authors always have Full Control access.