Any member of the public is a licensee, and is. You accept the license if you copy, modify or. A Modified Version of the Document means any work containing the. Document or a portion of it, either copied verbatim, or with modifications. A Secondary Section is a named appendix or a front matter section of the. Document that deals exclusively with the relationship of the publishers or. Document to the Documents overall subject or to related. Thus, if the Document is in part a textbook of mathematics, a. Secondary Section may not explain any mathematics. The relationship could. The Invariant Sections are certain Secondary Sections whose titles are. Invariant Sections, in the notice that says. Document is released under this License. If a section does not. Secondary then it is not allowed to be. Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are. The Cover Texts are certain short passages of text that are listed, as. Front Cover Texts or Back Cover Texts, in the notice that says that the. Document is released under this License. A Front Cover Text may be at most. Back Cover Text may be at most 2. A Transparent copy of the Document means a machine readable copy. A copy made in. an otherwise Transparent file format whose markup, or absence of markup. Transparent. An image format is not Transparent if used for. A copy that is not Transparent is called. Examples of suitable formats for Transparent copies include plain ASCII. Texinfo input format, La. Te. X input format, SGML or XML. DTD, and standard conforming simple HTML. Post. Script or PDF designed for human modification. Examples of transparent. PNG, XCF and JPG. Opaque formats include proprietary. SGML or XML for which the DTD andor processing tools are not generally. HTML, Post. Script or PDF produced by. The Title Page means, for a printed book, the title page itself, plus. License requires to appear in the title page. For works in formats which. Title Page means the text near the. A section Entitled XYZ means a named subunit of the Document whose title. XYZ or contains XYZ in parentheses following text that. XYZ in another language. Here XYZ stands for a specific. Acknowledgements, Dedications. Endorsements, or History. To Preserve the Title of such a section. Document means that it remains a section Entitled. XYZ according to this definition. The Document may include Warranty Disclaimers next to the notice which. License applies to the Document. These Warranty. Disclaimers are considered to be included by reference in this License. Warranty Disclaimers may have is void and has no effect on the. License. 2. VERBATIM COPYING. You may copy and distribute the Document in any medium, either. License, the copyright. License applies to the. Document are reproduced in all copies, and that you add no other. License. You may not use technical. However, you may accept compensation in. If you distribute a large enough number of copies you. You may also lend copies, under the same conditions stated above, and you. COPYING IN QUANTITY. If you publish printed copies or copies in media that commonly have. Document, numbering more than 1. Documents license notice requires Cover Texts, you must enclose the. Cover Texts. Front Cover Texts on the front cover, and Back Cover Texts on the back. Both covers must also clearly and legibly identify you as the. The front cover must present the full title. You may add. other material on the covers in addition. Copying with changes limited to. Document and satisfy. If the required texts for either cover are too voluminous to fit legibly. If you publish or distribute Opaque copies of the Document numbering more. Transparent copy. Opaque copy, or state in or with each Opaque copy a. Transparent copy of the Document, free of added material. If you use the. latter option, you must take reasonably prudent steps, when you begin. Opaque copies in quantity, to ensure that this Transparent. Opaque copy directly or. It is requested, but not required, that you contact the authors of the. Document well before redistributing any large number of copies, to give. Document. 4. MODIFICATIONS. You may copy and distribute a Modified Version of the Document under the. Modified Version under precisely this License, with the Modified Version. Document, thus licensing distribution and. 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. Document, and from those of previous versions which should. History section of the Document. You may use the same title as a previous version if the original. List on the Title Page, as authors, one or more persons or entities. Modified Version. Document. all of its principal authors, if it has fewer than five, unless they. State on the Title page the name of the publisher of the Modified. Version, as the publisher. Preserve all the copyright notices of the Document. Add an appropriate copyright notice for your modifications adjacent to. Include, immediately after the copyright notices, a license notice. Modified Version under the terms. License, in the form shown in the Addendum below. Preserve in that license notice the full lists of Invariant Sections and. Cover Texts given in the Documents license notice. Include an unaltered copy of this License. Preserve the section Entitled History, Preserve its Title, and add to. Modified Version as given on the Title Page. If there is no. section Entitled History in the Document, create one stating the. Document as given on its. Title Page, then add an item describing the Modified Version as stated. Preserve the network location, if any, given in the Document for public. Transparent copy of the Document, and likewise the network. Document for previous versions it was based on. These may be placed in the History section. You may omit a network. Document itself, or if the original publisher of the version it refers. For any section Entitled Acknowledgements or Dedications, Preserve. Title of the section, and preserve in the section all the substance. Preserve all the Invariant Sections of the Document, unaltered in their. Section numbers or the equivalent are not. Delete any section Entitled Endorsements. Such a section may not be. Modified Version. Do not retitle any existing section to be Entitled Endorsements or to. Invariant Section. Preserve any Warranty Disclaimers. If the Modified Version includes new front matter sections or appendices.