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This disk contains freeware from many authors. Freeware is software you can copy and give away. But it is restricted in other ways. Please see author's copyrights and ``public licenses'' along with their programs.

As you saw on the copyright page and will find in the electronic files, my electronic book is copyrighted. However, the programs I wrote that display the book and its figures are available to you under the GNU public license (see below). I have signed over copyright of the book text to a traditional book publisher[*]; however, I did not grant them the electronic rights. I license you, the general public, to make electronic copies of the entire book provided that you do not remove or alter this licensing statement. Please respect the publisher's legal rights and do not make paper copies from your copy of the electronic book.

We (you and I) are indebted to many people who have generously contributed software to the public good. I'll mention here only those outside the Stanford University research group whose contributions are widely used and on which we deeply depend:

		TEXDon Knuth, Stanford University
		LATEXLeslie Lamport, Stanford Research Institute
		ratfor77 		Ozan Yigit, Arizona, and Wes Bauske, IBM
		ratfor90 		Bob Clapp
		dvips 		Tomas Rokicki, Stanford University
I feel sure the list of valuable contributors is much longer. I am afraid I may have overlooked the names of some, and others have modestly omitted leaving their name and copyright.

My electronic book is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

My electronic book is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Massachusetts Ave., Cambridge, MA 02139, USA.

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Stanford Exploration Project