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This update is not required for all devices. It is necessary for supporting some use cases for offline licenses on devices that do not support usage tables. Most devices are expected to support usage tables. There were no new changes to the OEMCrypto code. However, the ODK library has been updated so the minior version has been updated to 4. There were also some changes to the unit tests. 1. We added more tests for pattern decryption. 2. We added more tests for buffer overflow handling. 4. We added some support for fuzz testing. These tests are not quite ready for wide use.
This is the OEMCrypto git repository. It is visible to Widevine partners, and contains documentation for OEMCrypto, as well as unit tests and reference code. Several versions of OEMCrypto are available on different branches. This is the only file on the master branch. Please use the git checkout command to work with the correct version of OEMCrypto, for example, to see version 14, use the command "git checkout origin/v14". Use "git branch -a" to see a list of all branches. Contact your Widevine TAM if you are unsure which branch you should use. The latest branch might have documentation without complete unit tests or sample code.