Add GPL information for the FreeImage library

Fixes #14

2 files changed, 12 insertions, 0 deletions

diff --git a/doc/imv.1 b/doc/imv.1
index 1d46709..3b9b2d2 100644
--- a/doc/imv.1
+++ b/doc/imv.1
@@ -83,5 +83,10 @@ Pause gif playback (pressing again unpauses).
 .TP
 .B \&.
 Step forward one frame (when playing gifs).
+.SH LEGAL
+This software is licensed under the MIT open source license, however this
+software also uses the FreeImage open source image library, which is licensed
+under the GNU GPLv2. Therefore, while the source code to imv is covered by the
+MIT license, all binary releases are subject to the terms of the GNU GPLv2.
 .SH AUTHOR
 Harry Jeffery
diff --git a/src/main.c b/src/main.c
index 571e476..cc06393 100644
--- a/src/main.c
+++ b/src/main.c
@@ -68,6 +68,13 @@ void print_usage(const char* name)
   "         'f': Toggle fullscreen\n"
   "         ' ': Toggle gif playback\n"
   "         '.': Step a frame of gif playback\n"
+  "\n"
+  "Legal:\n"
+  "imv is published under the MIT open source license.\n"
+  "\n"
+  "This software uses the FreeImage open source image library.\n"
+  "See http://freeimage.sourceforge.net for details.\n"
+  "FreeImage is used under the GNU GPLv2.\n"
   , IMV_VERSION, name);
 }