Appendix 9: GNU Free Documentation License

275

prudent steps, when you begin distribution of Opaque copies in quantity, to

ensure that this Transparent copy will remain thus accessible at the stated

location until at least one year after the last time you distribute an Opaque

copy (directly or through your agents or retailers) of that edition to the public.

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.

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:

  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.

  List on the Title Page, as authors, one or more persons or entities re 

sponsible 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).

  State on the Title page the name of the publisher of the Modified Version,

as the publisher.