---
title: "DRM License Server 5.11.6"
description: "This release adds comparative verification and blocking of client OS to License Cipher, and updates the PlayReady Server SDK to version 4.8.92."
---
> For the complete documentation index, see [llms.txt](https://docs.doverunner.com/llms.txt).

## License Cipher Client OS Verification

- Added comparative verification and blocking of client OS to License Cipher.

## PlayReady Server SDK Update

- Updated PlayReady Server SDK to version 4.8.92.