Operation Manual

1991 Free Software Foundation, Inc.

51 Franklin Street, Fifth Floor, Boston,

MA 02110-1301, USA

Everyone is permitted to copy and distribute verbatim

copies of this license document, but changing it is not

allowed.

Preamble

The licenses for most software are designed to take

away your freedom to share and change it. By con-

trast, the GNU General Public License is intended to

guarantee your freedom to share and change free

software--to make sure the software is free for all its

users. This General Public License applies to most of

the Free Software Foundation‘s software and to any

other program whose authors commit to using it.

(Some other Free Software Foundation software is

covered by the GNU Lesser General Public License

instead.) You can apply it to your programs, too. When

we speak of free software, we are referring to

freedom, not price. Our General Public Licenses are

designed to make sure that you have the freedom to

distribute copies of free software (and charge for this

service if you wish), that you receive source code or

can get it if you want it, that you can change the

software or use pieces of it in new free programs; and

that you know you can do these things. To protect

your rights, we need to make restrictions that forbid

anyone to deny you these rights or to ask you to sur-

render the rights. These restrictions translate to certain

responsibilities for you if you distribute copies of the

software, or if you modify it. For example, if you distri-

bute copies of such a program, whether gratis or for a

fee, you must give the recipients all the rights that you

have. You must make sure that they, too, receive or

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