LICENSE.md: Explain why three licenses were used

diff --git a/LICENSE.md b/LICENSE.md
index 0572390635d944af818ebe132019722650e3ac0b..17387a239eaa845ba8f2aca15921a1854c003c0f 100644 (file)
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -137,3 +137,16 @@ freely, subject to the following restrictions:
 2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.
+
+
+Why Three Licenses?
+===================
+
+The zlib License could have been used instead of the Modified (3-clause) BSD
+License, and since the IJG License effectively subsumes the distribution
+conditions of the zlib License, this would have effectively placed
+libjpeg-turbo binary distributions under the IJG License.  However, the IJG
+License specifically refers to the Independent JPEG Group and does not extend
+attribution and endorsement protections to other entities.  Thus, it was
+desirable to choose a license that granted us the same protections for new code
+that were granted to the IJG for code derived from their software.