Background: When issuing Playready DRM licenses, you can specify an expiration time on the license. From what I understand, if the license hasn't expired, the license is stored somewhere on the client and subsequent requests can just use this license instead of making another drm request to obtain a new license.
On Mac and Windows these licenses are stored in specific directories like: /Library/Application Support/Microsoft/PlayReady/mspr.hds (mac) C:/ProgramData/Microsoft/PlayReady/mspr.hds (windows)
You can just remove these files in order to clear the stored licenses.
I wasn't able to find documentation on how to clear the licenses on mobile devices (Android or iOS). Could someone please advise?