Adding clauses to LICENSE file

LICENSE.asciidoc

@@ -0,0 +1,14 @@
+This work is licensed under a http://creativecommons.org/licenses/by-sa/4.0/[Creative Commons
+Attribution-ShareAlike 4.0 International License].
+
+[IMPORTANT]
+--
+- Please do *not* sell electronic or printed copies of the book unless you have clearly and
+  prominently mentioned in the description that these copies are *not* from the original author of
+  this book.
+- Attribution *must* be shown in the introductory description and front page of the document by
+  linking back to {homepage} and clearly indicating that the original text can be fetched from this
+  location.
+- All the code/scripts provided in this book is licensed under the
+  http://www.opensource.org/licenses/bsd-license.php[3-clause BSD License] unless otherwise noted.
+--

LICENSE.txt

@@ -1,3 +0,0 @@
-This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
-
-See http://creativecommons.org/licenses/by-sa/4.0/ for the full text of the License.

README.asciidoc

@@ -11,7 +11,7 @@ To convert the book from AsciiDoc format to output formats (HTML, PDF, EPUB, etc
 https://github.com/swaroopch/byte_of_python/blob/master/commands.bash[commands.bash].
 
 To understand the freedoms you have with this book, see
-https://github.com/swaroopch/byte_of_python/blob/master/LICENSE.txt[LICENSE.txt].
+https://github.com/swaroopch/byte_of_python/blob/master/LICENSE.asciidoc[LICENSE.asciidoc].
 
 To translate this book, https://help.github.com/articles/fork-a-repo[fork the repository].