ZyXEL Communications ZYWALL USG 20 Manual page 909

Appendix E Open Software Announcements
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what the program that uses the Library does.
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forming a work based on the Library, and copy and distribute such modifications
or work under the terms of Section 1 above, provided that you also meet all of
these conditions: a) The modified work must itself be a software library. b) You
must cause the files modified to carry prominent notices stating that you changed
the files and the date of any change. c) You must cause the whole of the work to
be licensed at no charge to all third parties under the terms of this License. d) If a
facility in the modified Library refers to a function or a table of data to be supplied
by an application program that uses the facility, other than as an argument passed
when the facility is invoked, then you must make a good faith effort to ensure
that, in the event an application does not supply such function or table, the facility
still operates, and performs whatever part of its purpose remains meaningful. (For
example, a function in a library to compute square roots has a purpose that is
entirely well-defined independent of the application. Therefore, Subsection 2d
requires that any application-supplied function or table used by this function must
be optional: if the application does not supply it, the square root function must
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does not bring the other work under the scope of this License.
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ZyWALL USG 20/20W User's Guide