OPK v16.4.1 release

This is a patch release that fixes a bug in the OPK where calling
OEMCrypto_MoveEntry() immediately after calling
OEMCrypto_CreateNewUsageEntry() returns an error when it should return
success.

CHANGELOG.md

@@ -2,6 +2,21 @@
 
 [TOC]
 
+## [Version 16.4.1][v16.4.1]
+
+Patch release which includes a fix for a bug in the OPK session state machine
+logic. Previously the state machine code would only allow OEMCrypto_MoveEntry()
+to be called when a usage entry had been loaded. This misses a few use cases
+from the CDM where OEMCrypto_MoveEntry() could be called immediately after
+opening a session or waiting for a license.
+
+This bug could result in situations where users are unable to download offline
+licenses. If the usage table is completely filled (~300 entries by default in
+OPK), then this bug may occur when the CDM tries to move old entries to make
+room for new licenses. Similarly, if the usage table has gaps where previous
+entries were deleted, then this bug may occur when the CDM tries to defragment
+the usage table by moving newer usage entries into those gaps.
+
 ## [Version 16.4 plus opk beta 2][v16.4+opk-beta2]
 
 Second beta release of the OEMCrypto Porting Kit (OPK), supporting OEMCrypto v16.
@@ -65,7 +80,7 @@ for more details.
 Public release for OEMCrypto API and ODK library version 16.4.
 
 
-
+[v16.4.1]: https://widevine-partner.googlesource.com/oemcrypto/+/refs/tags/v16.4.1
 [v16.4]: https://widevine-partner.googlesource.com/oemcrypto/+/refs/tags/v16.4
 [v16.4+extra-test]: https://widevine-partner.googlesource.com/oemcrypto/+/refs/tags/v16.4+extra-tests
 [v16.4+doc-updates]: https://widevine-partner.googlesource.com/oemcrypto/+/refs/tags/v16.4+doc-updates