I missed the Objective C files when updating the copyright date...

src/video/cocoa/SDL_cocoaevents.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public

src/video/cocoa/SDL_cocoakeyboard.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public

src/video/cocoa/SDL_cocoamodes.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public

src/video/cocoa/SDL_cocoamouse.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public

src/video/cocoa/SDL_cocoaopengl.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public

src/video/cocoa/SDL_cocoavideo.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public

src/video/cocoa/SDL_cocoawindow.m

 /*
     SDL - Simple DirectMedia Layer
-    Copyright (C) 1997-2009 Sam Lantinga
+    Copyright (C) 1997-2010 Sam Lantinga
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public