hawkeye camera support(not tested)

framework/Inspectron.HawkEye/RTSP/Sdp/EncriptionKey.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Diagnostics.Contracts;
+
+namespace Inspectron.HawkEye.RTSP.Sdp
+{
+    public class EncriptionKey
+    {
+        public EncriptionKey(string p)
+        {
+        }
+
+        public static EncriptionKey ParseInvariant(string value)
+        {
+            if (value == null)
+                throw new ArgumentNullException("value");
+
+            Contract.EndContractBlock();
+
+            throw new NotImplementedException();
+        }
+    }
+}