update license to cc by-sa 4.0

LICENSE

@@ -2,5 +2,5 @@ LICENSING TERMS
 
 The HTML files of the book and illustrations in
 directory 'html/fig' are licensed under Creative Commons
-Attribution-NonCommercial-ShareAlike 3.0 Unported License
-(http://creativecommons.org/licenses/by-nc-sa/3.0/).
+Attribution-ShareAlike 4.0 International License
+(http://creativecommons.org/licenses/by-sa/4.0/).

LICENSE.src

@@ -1,10 +1,10 @@
 
     LICENSING TERMS
 
- 1. sicp-pocket.texi, the HTML files of the book, and illustrations in 
-    directory 'html/fig' are licensed under Creative Commons 
-    Attribution-NonCommercial-ShareAlike 3.0 Unported License 
-    (http://creativecommons.org/licenses/by-nc-sa/3.0/).
+ 1. sicp-pocket.texi, the HTML files of the book, and illustrations in
+    directory 'html/fig' are licensed under Creative Commons
+    Attribution-ShareAlike 4.0 International License
+    (http://creativecommons.org/licenses/by-sa/4.0/).
 
  2. Javascript libraries have their own individual licenses.
 

README.md

@@ -37,7 +37,7 @@ Acknowledgements
 License
 -------
 
-The source file `sicp-pocket.texi,` HTML content of the book, and diagrams in directory `html/fig` are licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License ([cc by-nc-sa](http://creativecommons.org/licenses/by-nc-sa/3.0/)).
+The source file `sicp-pocket.texi,` HTML content of the book, and diagrams in directory `html/fig` are licensed under Creative Commons Attribution-ShareAlike 4.0 International License ([cc by-sa](http://creativecommons.org/licenses/by-sa/4.0/)).
 
 Most of the scripts are licensed under GNU General Public License version 3 (for details, see LICENSE.src).
 

html/index.xhtml

@@ -39,12 +39,10 @@
 
 <object style="width: 2.42ex; height: 2.42ex;" data="fig/icons/by.std.svg" type="image/svg+xml">SVG</object>
 
-<object style="width: 2.42ex; height: 2.42ex;" data="fig/icons/nc.std.svg" type="image/svg+xml">SVG</object>
-
 <object style="width: 2.42ex; height: 2.42ex;" data="fig/icons/sa.std.svg" type="image/svg+xml">SVG</object>
 
-<p>This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0
-Unported License (<a href="http://creativecommons.org/licenses/by-nc-sa/3.0/"><abbr>CC BY-NC-SA 3.0</abbr></a>).
+<p>This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
+International License (<a href="http://creativecommons.org/licenses/by-sa/4.0/"><abbr>CC BY-SA 4.0</abbr></a>).
 Based on a work at <a href="http://mitpress.mit.edu/sicp/">mitpress.mit.edu</a>.
 </p>
 <p>The <abbr>MIT</abbr> Press<br />

sicp-pocket.texi

@@ -11,8 +11,8 @@
 @set utfversiondate  January 29, 2015
 @comment
 @comment             This file is licensed under a Creative Commons
-@comment             Attribution-NonCommercial-ShareAlike 3.0 Unported License
-@comment             http://creativecommons.org/licenses/by-nc-sa/3.0/
+@comment             Attribution-ShareAlike 4.0 International License
+@comment             http://creativecommons.org/licenses/by-sa/4.0/
 @comment             
 @comment             This is a Texinfo file.  To convert it to Info hypertext
 @comment             format, you will need the `makeinfo' program from the GNU
@@ -129,12 +129,11 @@
 @noindent
 @image{fig/icons/cc, 6mm,,,.std.svg}
 @image{fig/icons/by, 6mm,,,.std.svg}
-@image{fig/icons/nc, 6mm,,,.std.svg}
 @image{fig/icons/sa, 6mm,,,.std.svg}
 
 @noindent
-This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0
-Unported License (@url{http://creativecommons.org/licenses/by-nc-sa/3.0/, @abbr{CC BY-NC-SA 3.0}}).
+This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
+International License (@url{http://creativecommons.org/licenses/by-sa/4.0/, @abbr{CC BY-SA 4.0}}).
 Based on a work at @url{http://mitpress.mit.edu/sicp/, mitpress.mit.edu}.
 
 @noindent