lexipixel - 1:16 am on May 6, 2012 (gmt 0)
Copyright notice is no longer required under U.S. law -- it is implied at the time the work is created.
The idea is "if you didn't create it, you know someone else did".
But still, the simple version of:
© YYYY, Copyright Holder
(the letter "C" in a circle, the first year of publication, and the copyright holder's name), are usually used -- anything more is usually just a wordy threat of prosecution for misuse.
With that said, here's what I include in my source code:
WARNING! Commercial Software, All Use Must Be Licensed
This software is protected by U.S. Copyright Law and International Treaties. Unauthorized use, duplication, reverse engineering, any form of redistribution, or use in part or in whole other than by prior, express, printed and signed license for use is subject to civil and criminal prosecution. If you have received this file in error, please notify copyright holder and destroy this and any other copies as instructed.
Everything you always wanted to know about (US) copyright can be found at: [copyright.gov...]