Update raycastlib.h

raycastlib.h

@@ -27,6 +27,27 @@
   author: Miloslav "drummyfish" Ciz
   license: CC0 1.0
   version: 0.8
+  
+  -----
+  
+  This work's goal is to never be encumbered by any exclusive intellectual
+  property rights.
+
+  The work is therefore provided under CC0 1.0 + additional WAIVER OF ALL
+  INTELLECTUAL PROPERTY RIGHTS that waives the rest of intellectual property
+  rights not already waived by CC0 1.0. The WAIVER OF ALL INTELLECTUAL PROPERTY
+  RGHTS is as follows:
+
+  Each contributor to this work agrees that they waive any exclusive rights,
+  including but not limited to copyright, patents, trademark, trade dress,
+  industrial design, plant varieties and trade secrets, to any and all ideas,
+  concepts, processes, discoveries, improvements and inventions conceived,
+  discovered, made, designed, researched or developed by the contributor either
+  solely or jointly with others, which relate to this work or result from this
+  work. Should any waiver of such right be judged legally invalid or ineffective
+  under applicable law, the contributor hereby grants to each affected person a 
+  royalty-free, non transferable, non sublicensable, non exclusive, irrevocable
+  and unconditional license to this right.
 */
 
 #include <stdint.h>