What is the Adobe Access DRM (version 5.2) "External CEK" feature?

[ Prior to Access 5.2 ]
The randomly-generated (or user-provided) Content Encryption Key is encrypted using an asymmetric "license server key" and then stored in the content's metadata. The CEK is never required to be persisted anywhere else (like a Key Management system or secure database). When a client device makes a license request, the content metadata is sent to the Access DRM License Server, which has the private asymmetric key needed to decrypt the CEK out of the metadata. The license server can then issue a license to the client containing this CEK. For more details on the entire workflow, please see this post: DRM Packaging and License Issuance Lifecycle/Workflow
[ New Feature introduced in Access DRM 5.2 - External CEK ]
Due to popular demand, version 5.2 of Access DRM introduced a new Key Retrieval scheme called "External CEK". The reason this name was chosen is because the CEK is now external from the metadata (where it traditionally resided). Instead of the encrypted CEK being stored in the content metadata, a CEK-ID is stored there instead. When the license server is processing a license request, if it detects that the KeyRetrievalType of the request is of type "ExternalKeyRetrieval", then the license server must implement logic to do a retrieval of the CEK, which is specific to the company using Access DRM. The key retrieval may be via a KeyManagementService, a SecureDatabase, or even something as simple as a locally-stored flat file (hopefully only for testing purposes).
Using internal-CEK or external-CEK is transparent to the client device; no code has to change (or has to change if you're upgrading from an earlier version of Access). The only changes needed to incorporate External-CEK into your Access DRM workflow is to make a change on the content packaging side (to enable E-CEK and specify the CEK-ID), and on the license server side (to recognize the KeyRetrieval type as E-CEK and then do a CEK fetch).
Details on how to integrate the External-CEK workflow into your Adobe Access DRM infrastructure is included in your Adobe Access v5.2 documentation and DVD.
cheers,
/Eric.

Thanks! Will automatic update select ‘Adobe Reader X’ after support ends for ‘Adobe Reader 9.5.5’ on June 23, 2013?

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[11/21/2014] Adobe Access DRM Customer Advisory - SEVERE - Chrome 39 Corruption of Adobe Access DRM License Store

[ Problem ]
The Chrome browser version 39 upgrade on Mac OS will cause a corruption to the Adobe Access DRM (Primetime DRM) license stores. Users of Chrome 39 on Mac OS will not be able to watch Adobe Access DRM protected content if they have previously played protected content, unless they manually reset their DRM license store. If the end-user does not manually reset their DRM license store, they will see a client-side DRM Error Code 3321 on every playback attempt.
This problem affects Mac users because Chrome will automatically update to a 64bit version of the browser. Windows users will not see this problem unless they opt-in for an upgrade to 64bit.
[ Workaround ]
Reset the Adobe Access DRM license store as per https://forums.adobe.com/thread/700107
[ Permanent Fix ]
Adobe will update the next version of Flash Player (December 2014) to accommodate this Chrome 39 upgrade scenario. Google and Microsoft will also integrate this new Flash Player into Chrome and Internet Explorer at their earliest convenience.
[ Background ]
Prior to Chrome 39, Chrome on Mac OS was using 32bit architecture. Chrome 39 enabled 64bit functionality, and MacOS will automatically upgrade Chrome 32bit to the 64bit version, which causes corruption to the Adobe Access DRM license store. As a result of this breaking change from Google. To mitigate this type of failure in the future, Adobe will do pre-emptive testing of Google’s upcoming dev-channel builds to ensure backwards-compatibility with Adobe Access DRM.

FOLLOWUP SENT OUT ON TUESDAY, 11/25/2014
Hello,
On Friday, November 21, Adobe distributed a Customer Advisory about a Chrome browser auto-update to version39 that caused playback of Adobe Access DRM streams to fail (with a DRM Error #3321 – 'Indiv Failed'). Only the Mac OS platform was affected. More details of the announcement can be found at: https://forums.adobe.com/thread/1641382
As of Tuesday, November 25th, an update to the Chrome browser has begun rolling out to resolve this issue. The updated version of Chrome browser (64bit) is 39.0.2171.71.
Cheers,
// Adobe Primetime DRM

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Thanks,
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licancabur123
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What is the Adobe Access DRM (version 5.2) "External CEK" feature?

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