User's Manual

43
English
4. You may copy and distribute the Library (or
a
portion or derivative of it, under Section 2) in
object
code or executable form under the terms
of
Sections 1 and 2 above provided that you
accompany
it with the complete corresponding
machine-readable
source code, which must be
distributed
under the terms of Sections 1 and 2
above
on a medium customarily used for software
interchange.
If distribution of object code is made
by
offering access to copy from a designated place,
then
offering equivalent access to copy the source
code
from the same place satisfi es 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 Libr
ary, but is designed to work with
the
Library by being compiled or linked with it,
is
called a “work that uses the Library”. Such a
work,
in isolation, is not a derivative work of the
Lib
rary, and therefore falls outside the scope of this
License.
However, linking a “work that uses the
Lib
rary” 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 ex
ecutables.
When a “work that uses the Library” uses material
from
a header fi le 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 signifi cant 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 de
fi ned by law.
If such an object fi le uses only numerical
pa
rameters, data structure layouts and accessors,
and
small macros and small inline functions (ten
lines
or less in length), then the use of the object
fi
le is unrestricted, regardless of whether it is
legally
a derivative work. (Executables containing
this
object code plus portions of the Library will still
fa
ll under Section 6.)
Otherwise, if the work is a derivative of the
Libr
ary, you may distribute the object code for the
work
under the terms of Section 6.Any executables
containing
that work also fall under Section 6,
whether
or not they are linked directly with the
Libr
ary 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 modifi cation of the work for the customer’s
own
use and reverse engineering for debugging
such modifi cations. 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 displays
copyright notices, you must include the copyright
notice for the Library among them, as well as a
reference directing the user to the copy of this
License. Also, you must do one of these things:
a) Accompany the work with the complete
corresponding machine-readable source code
for the Library including whatever changes were
used in the work (which must be distributed
under Sections 1 and 2 above); and, if the work
is an executable linked with the Library, with the
complete machine-readable “work that uses the
Library”, as object code and/or source code, so
that the user can modify the Library and then relink
to produce a modifi ed executable containing the
modifi ed Library. (It is understood that the user
who changes the contents of defi nitions fi les in the
Library will not necessarily be able to recompile the
application to use the modifi ed defi nitions.)
b) Use a suitable shared library mechanism for
linking with the Library. A suitable mechanism is
one that (1) uses at run time a copy of the library
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modifi ed version of the library, if the user installs
one, as long as the modifi ed version is interface
- compatible with the version that the work was
made with.
c) Accompany the work with a written offer, valid
for at least three years, to give the same user the
materials specifi ed in Subsection 6a, above, for a
charge no more than the cost of performing this
distribution.
d) If distribution of the work is made by offering
access to copy from a designated place, offer
equivalent access to copy the above speci
fi ed
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of these materials or that you have already sent this
user a copy. For an executable, the required form
of
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any
data and utility programs needed for
reproducing
the executable from it. However, as a
special
exception, the materials to be distributed
need
not include anything that is normally
distributed
(in either source or binary form) with the
major
components (compiler, kernel, and so on) of
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runs,
unless that component itself accompanies
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executable.