Add explicit copyright notices, attributions have always been present in many places.
@@ -22,3 +22,15 @@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Copyright for portions of project Adobe DNG Software Development Kit (SDK) are
+held by Adobe Systems, 2013 as part of project Adobe DNG SDK and are provided
+under the DNG SDK License Agreement.
+
+Copyright for portions of project The Munsell and Kubelka-Munk Toolbox are
+held by Paul Centore, 2014 as part of project The Munsell and Kubelka-Munk
+Toolbox.
+
+Copyright for portions of project The ColorChecker (since 1976!) are
+held by Danny Pascale, 2004-2012 as part of project The ColorChecker
+(since 1976!) and are used by permission.
