-How to Maintain Copyright Years for GNU Emacs
- (see also file "copyright" in this directory)
+HOW TO MAINTAIN COPYRIGHT YEARS FOR GNU EMACS
+
+Maintaining copyright years is now very simple: every time a new year
+rolls around, add that year to every copyright notice.
+
+There's no need to worry about whether an individual file has changed
+in a given year - it's sufficient that Emacs as a whole has changed.
+
+For more detailed information on maintaining copyright, see the file
+"copyright" in this directory.
+
+The previous policy was more complex, but is now only of historical
+interest (see versions of this file from before 2009).
+
+The refcards in etc/refcards can print only the latest copyright year,
+but should keep the full list in a comment in the source.
+
"Our lawyer says it is ok if we add, to each file that has been in Emacs
since Emacs 21 came out in 2001, all the subsequent years[1]. We don't
need to check whether *that file* was changed in those years.
It's sufficient that *Emacs* was changed in those years (and it was!).
-
+
For those files that have been added since then, we should add
the year it was added to Emacs, and all subsequent years."
-
+
--RMS, 2005-07-13
[1] Note that this includes 2001 - see
<http://lists.gnu.org/archive/html/emacs-pretest-bug/2006-12/msg00119.html>
-
-
-For the refcards under etc/, it's ok to simply use the latest year
-(typically in a `\def\year{YEAR}' expression) for the rendered copyright
-notice, while maintaining the full list of years in the copyright notice
-in the comments.
-
-------------------------------------------------------------------------------
-
-
-Following is the policy that we tried to write down one time (mid 2005).
-Although it is incorrect, we keep it around to remind us how complicated
-things used to be (and may become in the future).
-
-
-Principle: Individual files need to have the year of the release
- in the copyright notice if there is significant change.
-
-
-Practice:
-
-- individual files
- - each must be examined, along w/ its history, by a human
- - automated tools facilitate but can never replace this process
-
-- year of the release
- - may be different from year of file introduction,
- or year of last significant change
- - sometimes the release year slips, leaving a file w/ prematurely
- marked release year => need update (e.g., s/2004/2005/ for Emacs 22)
- - intervening years (between releases) are not valid and may cause
- embarrassment later in case of dispute => remove (however, see next)
- - years for new files (merged, contributed) that have been separately
- published are valid even if between releases => leave alone
-
-- significant change
- - insignificant
- - whitespace
- - copyright notice
- - version control tags
- - simple var/func renaming
- - in-file reorganization/reordering
- - typos
- - small bugfixes
- - small docfixes
- - filename renaming
- - most everything else is significant
- - change to interface
- - change in functionality
- - new file
- - many small changes may be significant in aggregate
-
-- when in doubt, ask (and update these guidelines -- thanks!)
-
-- sometimes people make mistakes
- - if they have not read these guidelines, point them here
- - if the guidelines are not helpful, improve the guidelines