I know by default, SP 2010 does not have a TIFF IRM protector.
Before trying to write a TIFF protector, if such a protector is already available could someone point me to it.
SharePoint's facilitates IRM for MS Office-related documents. For other app documents (e.g., PDF & TIFF), it will have to be custom-built or provided by 3rd party vendors (e.g., NextLabs). There are provisions for Custom Protectors within SharePoint where one can build their own protectors.