They are all somewhat exposed to Microsoft’s recent DRM features in Office 2003. I don’t really know the details of Microsoft’s product but one likely fact is that it works only on Office documents which is a big limitation. P
eople sometimes don't recognize that this is a severe limitation - after all, the whole world uses Office, doesn't it. Well yes, but there are some key other formats out there which are every bit as sensitive as Word and Excel. Graphics (Photoshop, Illustrator) and Cad (Autodesk and SolidWorks) come to mind.