License correction

Author: Bernhard Kerbl

LICENSE.md

@@ -81,3 +81,11 @@ GOODS OR SERVICES, 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 FROM, OUT OF OR  
 IN CONNECTION WITH THE *SOFTWARE* OR THE USE OR OTHER DEALINGS IN THE *SOFTWARE*.  
+
+## 6.  Files subject to permissive licenses
+The contents of the file ```utils/loss_utils.py``` are based on publicly available code authored by Evan Su, which falls under the permissive MIT license. 
+
+Title: pytorch-ssim
+Project code: https://github.com/Po-Hsun-Su/pytorch-ssim
+Copyright Evan Su, 2017
+License: https://github.com/Po-Hsun-Su/pytorch-ssim/blob/master/LICENSE.txt (MIT)