copyright-update is an interactive autoloaded compiled Lisp function in `copyright.el'.

(copyright-update &optional ARG INTERACTIVEP)

Update copyright notice to indicate the current year.
With prefix ARG, replace the years in the notice rather than adding
the current year after them. If necessary, and
`copyright-current-gpl-version' is set, any copying permissions
following the copyright are updated as well.
If non-nil, INTERACTIVEP tells the function to behave as when it's called