I've seen some projects that - with each new year - start to change all files in their source-tree to update the copyright year. Isn't this just pushing hot air on a level of magnitude? AFAIK: ...
Ever since I started programming I've seen a header at the top of most code files indicating some sort of copyright: e.g. /* Copyright (c) 1998 Innotech */ or /* Copyright (c) 1998-2008 Innotech ...