Appendix 9: GNU Free Documentation License

277

  Preserve all the Invariant Sections of the Document, unaltered in their

text and in their titles. Section numbers or the equivalent are not con 

sidered part of the section titles.

  Delete any section entitled  Endorsements . Such a section may not be

included in the Modified Version.

  Do not retitle any existing section as  Endorsements  or to conflict in

title with any Invariant Section.

If the Modified Version includes new front matter sections or appendices that

qualify as Secondary Sections and contain no material copied from the Doc 

ument, you may at your option designate some or all of these sections as

invariant. To do this, add their titles to the list of Invariant Sections in the

Modified Version's license notice. These titles must be distinct from any other

section titles.

You may add a section entitled  Endorsements , provided it contains nothing

but endorsements of your Modified Version by various parties   for example,

statements of peer review or that the text has been approved by an organiza 

tion as the authoritative definition of a standard.

You may add a passage of up to five words as a Front Cover Text, and a

passage of up to 25 words as a Back Cover Text, to the end of the list of Cover

Texts in the Modified Version. Only one passage of Front Cover Text and one

of Back Cover Text may be added by (or through arrangements made by) any

one entity. If the Document already includes a cover text for the same cover,

previously added by you or by arrangement made by the same entity you are

acting on behalf of, you may not add another; but you may replace the old

one, on explicit permission from the previous publisher that added the old one.

The author(s) and publisher(s) of the Document do not by this License give

permission to use their names for publicity for or to assert or imply endorse 

ment of any Modified Version.