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107

Others

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

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Lesser license provides advantages in certain special

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For example, on rare occasions, there may be a special need

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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

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DISTRIBUTION AND MODIFICATION

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