Updated license to clarify how permission is typically granted.

LICENSE

@@ -1,5 +1,5 @@
 Spine Runtimes Software License
-Version 2
+Version 2.1
 
 Copyright (c) 2013, Esoteric Software
 All rights reserved.
@@ -7,19 +7,21 @@ 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, 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+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
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.