KB937143 Fix

Introduction

As of October 16, 2007, we have several confirmed reports that attempts to acquire a digital rights management license for protected content through iStreamPlanet's PayCast® system would fail. This includes, but may not be limited to, licenses acquired through Challenge windows invoked by the media header. The indicators that a system may have been affected are that the "Play" button at the bottom of the window would not Activate. Additional indicators are that scripted event handlers, such as script-invoked links and form input disabling, would not react as scripted.

In some versions of Windows Vista, this may or may not also cause the Challenge window to close spontaneously with or without user interaction. We have not confirmed if this is a result of the same problem though it appears to be related.

We have determined that the probably cause of this problem is due to Cumulative Security Update for Internet Explorer 7 (KB937143). Once removed, the Challenge windows appear to react as scripted and successfully deliver the requested licenses. Please note that our tests indicate that the license does deliver in certain cases but does not instantiate inside the Windows Media Player.

We have not determined the extent of the systems that are affected by this update or that it has in fact affected all such comparable systems, though we surmise that it affects many users of Microsoft Internet Explorer 7 on Windows-based systems. Internally, we have experienced this problem on the following:



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Unconfirmed issues with this security update

Additionally, there have been unconfirmed reports of other issues being generated by this update. For more information on these reports that may or may not be affecting your systems, please follow any of these links:

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Removing the security update

Follow these steps to remove the update.
  1. Confirm that the update has been installed
    To confirm that the update exists in your system, open the Control Panel and click Windows Update.


    An Internet Explorer window will open to your Windows Update Home. Once active, click on Review your update history.


    In the listing that appears, look for Cumulative Security Update for Internet Explorer system info (KB937143) as shown here.


  2. Locate the update
    In the Control Panel, click Add or Remove Programs. Once the dialog window opens, check the box marked Show updates and then scroll down to the Windows Internet Explorer 7 - Software Updates listings.


  3. Remove the update
    Click Remove next to the KB937143 update. In the dialog window that opens, click Next.


    The update removal will run several processes, similar to this:


  4. Restart
    Once completed, you will need to restart your computer in order for the update removal to take effect.


Please note that we have not confirmed that this update uninstallation will work on all systems. Additional updates may need to be removed including: Alternatively, we also recommend reinstalling Microsoft Internet Explorer 7.

To re-install the update, go here, locate the download appropriate to your system and install it.

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Known issues with this security update

Microsoft has reported several known and unconfirmed issues with this update which can be viewed here (MS07-045: Cumulative Security Update for Internet Explorer).

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Additional Resources

  1. iStreamPlanet DRM FAQ
  2. iStreamPlanet DRM Web Services
  3. iStreamPlanet PayCast® Services
  4. MS07-045: Cumulative Security Update for Internet Explorer
  5. http://www.microsoft.com/windows/windowsmedia/player/faq/drm.mspx


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