Minor license update for clarity.

LICENSE

@@ -1,19 +1,20 @@
 Spine Runtimes Software License
-Version 2.1
+Version 2.2
 
 Copyright (c) 2013, Esoteric Software
 All rights reserved.
 
 You are granted a perpetual, non-exclusive, non-sublicensable and
-non-transferable license to install, execute and perform the Spine Runtimes
-Software (the "Software") solely for internal use. Without the written
-permission of Esoteric Software (typically granted by licensing Spine), you
-may not (a) modify, translate, adapt or otherwise create derivative works,
-improvements of the Software or develop new applications using the Software
-or (b) remove, delete, alter or obscure any trademarks or any copyright,
-trademark, patent or other intellectual property or proprietary rights notices
-on or in the Software, including any copy thereof. Redistributions in binary
-or source form must include this license and terms.
+non-transferable license to use, install, execute and perform the Spine
+Runtimes Software (the "Software") and derivative works solely for personal or
+internal use. Without the written permission of Esoteric Software (typically
+granted by licensing Spine), you may not (a) modify, translate, adapt or
+otherwise create derivative works, improvements of the Software or develop
+new applications using the Software or (b) remove, delete, alter or obscure
+any trademarks or any copyright, trademark, patent or other intellectual
+property or proprietary rights notices on or in the Software, including any
+copy thereof. Redistributions in binary or source form must include this
+license and terms.
 
 THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF