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APPENDIX
3. You may opt to apply the terms of the ordinary GNU
General Public License instead of this License to a given
copy of the Library. To do this, you must alter all the
notices that refer to this License, so that they refer to the
ordinary GNU General Public License, version 2, instead
of to this License. (If a newer version than version 2 of
the ordinary GNU General Public License has appeared,
then you can specify that version instead if you wish.) Do
not make any other change in these notices.
Once this change is made in a given copy, it is irrevers-
ible for that copy, so the ordinary GNU General Public
License applies to all subsequent copies and derivative
works made from that copy.
This option is useful when you wish to copy part of the
code of the library into a program that is not a library.
4. You may copy and distribute the library (or a portion or
derivative of it, under Section 2) in object code or exe-
cutable form under the terms of Sections 1 and 2 above
provided that you accompany it with the complete cor-
responding machine-readable source code, which must
be distributed under the terms of sections 1 and 2
above on a medium customarily used for software inter-
change.
If distribution of object code is made by offering access
to copy from a designated place, then offering equiva-
lent access to copy the source code from the same
place satisfies the requirement to distribute the source
code, even though third parties are not compelled to
copy the source along with the object code.
5. A program that contains no derivative of any portion of
the Library, but is designed to work with the Library by
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uses the Library”. Such a work, in isolation, is not a
derivative work of the Library, and therefore falls outside
the scope of this license.
However, linking a “work that uses the library” with the
Library creates an executable that is a derivative of the
Library (because it contains portions of the library),
rather than a “work that uses the library”. The executable
is therefore covered by this license. Section 6 states
terms for distribution of such executable.
When a “work that uses the library” uses material from
a header file that is part of the library, the object code
for the work may be a derivative work of the library even
though the source code is not.
Whether this is true is especially significant if the work
can be linked without the library, or if the work is itself a
library. The threshold for this to be true is not precisely
defined by law.
If such an object file uses only numerical parameters,
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ros and small inline functions (ten lines or less in
length), then the use of the object file is unrestricted,
regardless of whether it is legally a derivative work.
(Executable containing this object code plus portions of
the library will still fall under Section 6.)
Otherwise, if the work is a derivative of the library, you
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terms of Section 6. Any executable containing that work
also fall under Section 6, whether or not they are linked
directly with the library itself.
6. As an exception to the sections above, you may also
combine or link a "work that uses the library" with the
library to produce a work containing portions of the
library, and distribute that work under terms of your
choice, provided that the terms permit modification of
the work for the customer's own use and reverse engi-
neering for debugging such modifications.
You must give prominent notice with each copy of the
work that the library is used in it and that the Library and
its use are covered by this license. You must supply a
copy of this license. If the work during execution dis-
plays copyright notices, you must include the copyright
notice for the library among them, as well as a reference
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must do one of these things:
a) Accompany the work with the complete correspond-
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interface-compatible with the version that the work
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c) Accompany the work with a written offer, valid for at
least three years, to give the same user the materials
specified in Subsection 6, above, for a charge no
more than the cost of performing this distribution.
d) If distribution of the work is made by offering access
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access to copy the above specified materials from
the same place.
e) Verify that the user has already received a copy of
these materials or that you have already sent this user
a copy.