ZyXEL Communications NSA221 User Manual page 481

It is requested, but not required, that you contact the authors of the Document
well before redistributing any large number of copies, to give them a chance to
provide you with an updated version of the Document.
4. MODIFICATIONS
You may copy and distribute a Modified Version of the Document under the
conditions of sections 2 and 3 above, provided that you release the Modified
Version under precisely this License, with the Modified Version filling the role of
the Document, thus licensing distribution and modification of the Modified Version
to whoever possesses a copy of it. In addition, you must do these things in the
Modified Version:
A. Use in the Title Page (and on the covers, if any) a title distinct from that of the
Document, and from those of previous versions
(which should, if there were any, be listed in the History section of the
Document). You may use the same title as a previous version if the original
publisher of that version gives permission.
B. List on the Title Page, as authors, one or more persons or entities
responsible for authorship of the modifications in the Modified Version, together
with at least five of the principal authors of the
Document (all of its principal authors, if it has fewer than five), unless they
release you from this requirement.
C. State on the Title page the name of the publisher of the Modified Version, as
the publisher.
D. Preserve all the copyright notices of the Document.
E. Add an appropriate copyright notice for your modifications adjacent to the other
copyright notices.
F. Include, immediately after the copyright notices, a license notice giving the
public permission to use the Modified Version under the terms of this License, in
the form shown in the Addendum below.
G. Preserve in that license notice the full lists of Invariant Sections and required
Cover Texts given in the Document's license notice.
NSA221 User's Guide
Appendix E Open Source Licences
481