Appendix A. GNU Free Documentation License

257

version of the Document.

5. MODIFICATIONS

You may copy and distribute a Modified Version of the Document under the conditions of sec 

tions 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 mod 

ification 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 less than

five). C. State on the Title page the name of the publisher of the Modified Version, as the pub 

lisher. 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. H. Include an unaltered copy of this License. I. Preserve the section

entitled "History", and its title, and add to it an item stating at least the title, year, new authors,

and publisher of the Modified Version as given on the Title Page. If there is no section entitled

"History" in the Document, create one stating the title, year, authors, and publisher of the Doc 

ument as given on its Title Page, then add an item describing the Modified Version as stated in

the previous sentence. J. Preserve the network location, if any, given in the Document for public

access to a Transparent copy of the Document, and likewise the network locations given in the

Document for previous versions it was based on. These may be placed in the "History" sec 

tion. You may omit a network location for a work that was published at least four years before

the Document itself, or if the original publisher of the version it refers to gives permission. K.

In any section entitled "Acknowledgements" or "Dedications", preserve the section's title, and

preserve in the section all the substance and tone of each of the contributor acknowledgements

and/or dedications given therein. L. Preserve all the Invariant Sections of the Document, unal 

tered in their text and in their titles. Section numbers or the equivalent are not considered part

of the section titles. M. Delete any section entitled "Endorsements." Such a section may not be

included in the Modified Version. N. 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 Document, 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 organization 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 endorsement of any Modified Version.

6. COMBINING DOCUMENTS