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Licenses, Copyrights and Notices for Open Source Components
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 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 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 executables.
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, data structure layouts and accessors, and
small macros 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. (Executables 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 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 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 engineering 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 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
modified executable containing the modified Library. (It is understood that the user who
changes the contents of definitions files in the Library will not necessarily be able to
recompile the application to use the modified definitions.
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 already present on the
user's computer system, rather than copying library functions into the executable, and (2)
will operate properly with a modified version of the library, if the user installs one, as
long as the modified 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 specified in Subsection 6a, above, for a charge no more than the cost of
performing this distribution.
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