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diff --git a/examples/logarithmic b/examples/logarithmic
index 7113534..731b27d 100644
--- a/examples/logarithmic
+++ b/examples/logarithmic
@@ -4,6 +4,16 @@
# curve linearisation to make the colour curves logarithmic.
+# Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+#
+# Permission is granted to copy, distribute and/or modify this document
+# under the terms of the GNU Free Documentation License, Version 1.3
+# or any later version published by the Free Software Foundation;
+# with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+# You should have received a copy of the GNU General Public License
+# along with this software package. If not, see <http://www.gnu.org/licenses/>.
+
+
import math
# Use linear RGB.