User manual

they have is not the original, so that any problems introduced by others will not

reflect on the original authors' reputations.

Finally, any free program is threatened constantly by software patents. We wish to

avoid the danger that redistributors of a free program will individually obtain patent

licenses, in effect making the program proprietary. To prevent this, we have made

it clear that any patent must be licensed for everyone's free use or not licensed at

all.

The precise terms and conditions for copying, distribution and modification follow.

TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

0. This License applies to any program or other work which contains a notice placed

by the copyright holder saying it may be distributed under the terms of this

General Public License. The "Program", below, refers to any such program or

work, and a "work based on the Program" means either the Program or any

derivative work under copyright law: that is to say, a work containing the

Program or a portion of it, either verbatim or with modifications and/or

translated into another language. (Hereinafter, translation is included without

limitation in the term "modification".) Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not covered by

this License; they are outside its scope. The act of running the Program is not

restricted, and the output from the Program is covered only if its contents

constitute a work based on the Program (independent of having been made by

running the Program).

Whether that is true depends on what the Program does.

1. You may copy and distribute verbatim copies of the Program's source code as

you receive it, in any medium, provided that you conspicuously and

appropriately publish on each copy an appropriate copyright notice and

disclaimer of warranty; keep intact all the notices that refer to this License and

to the absence of any warranty; and give any other recipients of the Program a

copy of this License along with the Program.

You may charge a fee for the physical act of transferring a copy, and you may at

your option offer warranty protection in exchange for a fee.

2. You may modify your copy or copies of the Program or any portion of it, thus

forming a work based on the Program, and copy and distribute such

modifications or work under the terms of Section 1 above, provided that you also

meet all of these conditions:

a) You must cause the modified files to carry prominent notices stating that you

changed the files and the date of any change.

b) You must cause any work that you distribute or publish, that in whole or in

part contains or is derived from the Program or any part thereof, to be

licensed as a whole at no charge to all third parties under the terms of this

License.

c) If the modified program normally reads commands interactively when run,

you must cause it, when started running for such interactive use in the most

ordinary way, to print or display an announcement including an appropriate

you provide a warranty) and that users may redistribute the program under