Operation Manual

Version 2, June 1991

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

contrast, 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