Version 18.1

Updates to OEMCrypto API, OPK, ODK, and unit tests.

See the file CHANGELOG.md for details.

util/test/test_clock.cpp

@@ -2,7 +2,9 @@
 // source code may only be used and distributed under the Widevine License
 // Agreement.
 //
-// Clock - A fake clock just for running tests.
+// Clock - A fake clock just for running tests. This is used when running
+// OEMCrypto unit tests. It is not used when tests include the CE CDM source
+// code because that uses the clock in cdm/test_host.cpp instead.
 
 #include <chrono>