Tuesday, November 03, 2009

WMRM DisableOnClockRollback

I've been working on a project which involves using Windows Media Rights Manager (WMRM) Digital Rights Management (DRM).  As part of that project I have been applying rights to specific content (movies in this case)to meet the rules specified by the client.

Unfortunately I was receiving an error and searching on the error message returned exactly no hits.

{"Error HRESULT E_FAIL has been returned from a call to a COM component."}

at WMRMOBJSLib.WMRMRightsClass.set_DisableOnClockRollback(Int32 pVal)

In case anyone else runs in to this in the future, here's what the bug actually was.

I was setting a DisableOnClockRollback value of true, but was getting the error when I did so.  A short MSDN search later and and I found http://msdn.microsoft.com/en-us/library/bb649390(VS.85).asp. In it is the line:

This property works only if you have set an expiration date first.

That'll be the problem then.


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