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Epson EH-LS10500 [7/29] Open source software and other licenses

Finally, software patents pose a constant threat to the existence of any free program. We

wish to make sure that a company cannot effectively restrict the users of a free program

by obtaining a restrictive license from a patent holder. Therefore, we insist that any

patent license obtained for a version of the library must be consistent with the full

freedom of use specified in this license.

Most GNU software, including some libraries, is covered by the ordinary GNU General

Public License. This license, the GNU Lesser General Public License, applies to certain

designated libraries, and is quite different from the ordinary General Public License. We

use this license for certain libraries in order to permit linking those libraries into non-

free programs.

When a program is linked with a library, whether statically or using a shared library, the

combination of the two is legally speaking a combined work, a derivative of the original

library. The ordinary General Public License therefore permits such linking only if the

entire combination fits its criteria of freedom. The Lesser General Public License

permits more lax criteria for linking other code with the library.

We call this license the "Lesser" General Public License because it does Less to protect

the user's freedom than the ordinary General Public License. It also provides other free

software developers Less of an advantage over competing non-free programs. These

disadvantages are the reason we use the ordinary General Public License for many

libraries. However, the Lesser license provides advantages in certain special

circumstances.

For example, on rare occasions, there may be a special need to encourage the widest

possible use of a certain library, so that it becomes a de-facto standard. To achieve this,

non-free programs must be allowed to use the library. A more frequent case is that a free

library does the same job as widely used non-free libraries. In this case, there is little to

gain by limiting the free library to free software only, so we use the Lesser General Public

License.

In other cases, permission to use a particular library in non-free programs enables a

greater number of people to use a large body of free software. For example, permission

to use the GNU C Library in non-free programs enables many more people to use the

whole GNU operating system, as well as its variant, the GNU/Linux operating system.

Although the Lesser General Public License is Less protective of the users' freedom, it

does ensure that the user of a program that is linked with the Library has the freedom

and the wherewithal to run that program using a modified version of the Library.

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

Pay close attention to the difference between a "work based on the library" and a "work

that uses the library". The former contains code derived from the library, whereas the

latter must be combined with the library in order to run.

GNU LESSER GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR

COPYING, DISTRIBUTION AND MODIFICATION

0. This License Agreement applies to any software library or other program which

contains a notice placed by the copyright holder or other authorized party saying it

may be distributed under the terms of this Lesser General Public License (also

called "this License"). Each licensee is addressed as "you".

A "library" means a collection of software functions and/or data prepared so as to

be conveniently linked with application programs (which use some of those

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The "Library", below, refers to any such software library or work which has been

distributed under these terms. A "work based on the Library" means either the

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containing the Library or a portion of it, either verbatim or with modifications

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"Source code" for a work means the preferred form of the work for making

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for all modules it contains, plus any associated interface definition files, plus the

scripts used to control compilation and installation of the library.

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

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contents constitute a work based on the Library (independent of the use of the

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does and what the program that uses the Library does.

1. You may copy and distribute verbatim copies of the Library's complete source

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appropriately publish on each copy an appropriate copyright notice and

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the absence of any warranty; and distribute a copy of this License along with the

Library.

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 th

e Library or any portion of it, thus

forming a work based on the Library, and copy and distribute such modifications

or work under the terms of Section 1 above, provided that you also meet all of these

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Open Source Software and Other Licenses

Epson EH-LS10500 [7/29] Open source software and other licenses

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