[danray]

Simpler, but not effective. In almost every country in the world, copyright vests in the author automatically, even if the author doesn't use the old "All Rights Reserved" magic words.

Practically speaking, not including anything about copyright is just going to make your users (or their lawyers) ask questions before they ship, or before they're acquired, or....

If you really want to put it into the world for anyone to use without restriction, put it in the public domain (e.g., http://creativecommons.org/choose/zero/). But public domaining doesn't happen by accident — just failing to mention copyright doesn't cut it.