Windows Media Player continues to play back an ACP signal in non-ACP-enabled mode even after you change to non-ACP-enabled media on a Windows Vista computer

This article has been archived. It is offered "as is" and will no longer be updated.
Consider the following scenario.
  • On a Windows Vista-based computer, you play copy-protected material that uses an analog output format in Windows Media Player.
  • You perform a suspend-and-resume cycle on the computer.
  • You change the media from Analog Copy Protection (ACP)-enabled media to non-ACP-enabled media.
In this scenario, Windows Media Player continues to play back an ACP signal in non-ACP-enabled mode.

Note This problem occurs only when Windows Media Player is still open on the Windows Vista-based computer. This problem does not occur if one of the following conditions is true:
  • You close the application before the operating system goes into standby (S3).
  • You close the application after the operating system resumes from standby (S3), and then you restart the application.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


No prerequisites are required.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, x86-based versions

File nameFile versionFile sizeDateTimePlatform
Update-bf.mumNot Applicable1,95213-Nov-200717:05Not Applicable
X86_1a431d495286e5ecad161bfd1b5d5492_31bf3856ad364e35_6.0.6000.16595_none_1fbb24e4f719849a.manifestNot Applicable69413-Nov-200717:05Not Applicable
X86_23c21e21fd125d9fcf62150db23e43ef_31bf3856ad364e35_6.0.6000.20719_none_a402cf6fb8c12823.manifestNot Applicable69413-Nov-200717:05Not Applicable
X86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.16595_none_b6b0eb549da4b5d4.manifestNot Applicable6,92813-Nov-200717:05Not Applicable
X86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.20719_none_b7950a8db67dd899.manifestNot Applicable6,92813-Nov-200717:05Not Applicable

Windows Vista, 64-bit versions

File nameFile versionFile sizeDateTimePlatform
Amd64_5644a130f52a1ceec64d1115d2806cca_31bf3856ad364e35_6.0.6000.16595_none_f4a4b78fae1a3683.manifestNot Applicable69813-Nov-200717:05Not Applicable
Amd64_af1db988e0adf31df9760bce55749a69_31bf3856ad364e35_6.0.6000.20719_none_7cf81e4403792feb.manifestNot Applicable69813-Nov-200717:05Not Applicable
Amd64_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.16595_none_12cf86d85602270a.manifestNot Applicable6,94413-Nov-200717:09Not Applicable
Amd64_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.20719_none_13b3a6116edb49cf.manifestNot Applicable6,94413-Nov-200717:09Not Applicable
Update-bf.mumNot Applicable1,96413-Nov-200717:05Not Applicable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the APC protection technology, visit the following Macrovision Web site: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Article ID: 944543 - Last Review: 01/16/2015 09:45:58 - Revision: 2.0

Windows Vista Business, Windows Vista Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Starter, Windows Vista Ultimate, Windows Vista Business 64-bit Edition, Windows Vista Enterprise 64-bit Edition, Windows Vista Home Basic 64-bit Edition, Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition

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