copyright detail this work is licensed under creative common attribution-noncommercialsharealike unported license this license is available at creativecommons org/licenses/by-nc-sa/ would have preferred to license the book under the less restrictive cc-by-sa license but unfortunately there are few unscrupulous organizations who search for and find freely licensed booksand then publish and sell virtually unchanged copies of the books on print on demand service such as lulu or kdp kdp has (thankfullyadded policy that gives the wishes of the actual copyright holder preference over non-copyright holder attempting to publish freely licensed work unfortunately there are many print-on-demand services and very few have as wellconsidered policy as kdp regretfullyi added the nc element to the license this book to give me recourse in case someone tries to clone this book and sell it commercially unfortunatelyadding nc limits uses of this material that would like to permit so have added this section of the document to describe specific situations where am giving my permission in advance to use the material in this book in situations that some might consider commercial if you are printing limited number of copies of all or part of this book for use in course ( like coursepack)then you are granted cc-by license to these materials for that purpose if you are teacher at university and you translate this book into language other than english and teach using the translated bookthen you can contact me and will grant you cc-by-sa license to these materials with respect to the publication of your translation in particularyou will be permitted to sell the resulting translated book commercially if you are intending to translate the bookyou may want to contact me so we can make sure that you have all of the related course materials so you can translate them as well of courseyou are welcome to contact me and ask for permission if these clauses are not sufficient in all casespermission to reuse and remix this material will be