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Appendix D Open Source Licences
NSA-220 User’s Guide
197
1. You may copy and distribute verbatim copies of the Library's complete source code as you
receive it, in any medium, provided that you conspicuously and appropriately publish on each
copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices
that refer to this License and to the absence of any warranty; and distribute a copy of this
License along with the Library. You may charge a fee for the physical act of transferring a
copy, and you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Library or any portion of it, thus 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 still compute square roots.) These requirements apply to the modified work as a
whole. If identifiable sections of that work are not derived from the Library, and can be
reasonably considered independent and separate works in themselves, then this License, and
its terms, do not apply to those sections when you distribute them as separate works. But when
you distribute the same sections as part of a whole which is a work based on the Library, the
distribution of the whole must be on the terms of this License, whose permissions for other
licensees extend to the entire whole, and thus to each and every part regardless of who wrote
it. Thus, it is not the intent of this section to claim rights or contest your rights to work written
entirely by you; rather, the intent is to exercise the right to control the distribution of derivative
or collective works based on the Library. In addition, mere aggregation of another work not
based on the Library with the Library (or with a work based on the Library) on a volume of a
storage or distribution medium does not bring the other work under the scope of this License.
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 irreversible 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 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
satisfies the requirement to distribute the source code, even though third parties are not