Digium Asterisk Appliance 50 AA50 Administrator's Manual page 152

Appendix C: Asterisk Appliance 50 (AA50) License Agreement
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.
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