Copyright registration of a computer program covers the entire copyrightable expression embodied in that program. Thus, flow charts, source codes, and object codes may all be protectible. As specified in the Copyright Office regulations and in Copyright Office Circular 61, screen displays may be protected to the extent they contain copyrightable authorship. If screen displays are mentioned on the application, they will be examined. Many registrants, however, claim copyright in the "entire work" without submitting a specific claim in the screen display.