An update for Windows Media Digital Rights Management-enabled players is available

Dotyczy: Windows Media Player 10Microsoft Windows Media Player 9 Series


This article describes an update to the Microsoft Windows Media Digital Rights Management (DRM) system. You can use this update to make the Windows Media DRM system more robust.


This update improves the robustness of the Windows Media DRM system. It also adds more integrity checks to the DRM system by installing two components on end users' computers. License issuers can verify that each user's computer has been updated before issuing or renewing licenses. Updates for the end user require the following actions:
  1. Updating the Windows Media Format run-time components.

    Note Applications that are based on the Windows Media Format SDK do not have to be modified. This update affects only the redistributable run-time components. However, ISVs are encouraged to include the new run-time components with their application.
  2. Re-individualizing the DRM component in their application.

More Information

Software update information

A supported update is now available from Microsoft, but it is only intended to correct the problem that is described in this article.

To resolve this problem, contact Microsoft Product Support Services to obtain the update. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Windows Media Format 9.5 Runtime

The following file is available for download from the Microsoft Download Center:
Download Download the WindowsMedia-KB891122-x86 package now.
File information
The English version of this update 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 tool in Control Panel.
   Date         Time   Version         Size       File name
28-Jan-2005 18:44 294,912 Blackbox.dll
28-Jan-2005 18:44 10.0.3790.3802 164,864 Cewmdm.dll
28-Jan-2005 18:44 258,296 Drmclien.dll
28-Jan-2005 18:44 96,768 Drmstor.dll
28-Jan-2005 18:44 173,304 Drmupgds.exe
28-Jan-2005 18:44 502,272 Drmv2clt.dll
28-Jan-2005 18:44 6,656 Laprxy.dll
28-Jan-2005 18:44 96,768 Logagent.exe
28-Jan-2005 18:44 142,336 Msnetobj.dll
28-Jan-2005 18:44 10.0.3790.3802 25,088 Mspmsnsv.dll
28-Jan-2005 18:44 10.0.3790.3802 173,568 Mspmsp.dll
28-Jan-2005 18:44 364,784 Msscp.dll
28-Jan-2005 18:44 10.0.3790.3802 315,904 Mswmdm.dll
28-Jan-2005 18:44 221,184 Qasf.dll
28-Jan-2005 18:44 5.2.3790.1230 47,104 Uwdf.exe
28-Jan-2005 18:44 5.2.3790.1230 15,872 Wdfapi.dll
28-Jan-2005 18:44 5.2.3790.1230 38,912 Wdfmgr.exe
28-Jan-2005 18:44 396,528 Wmadmod.dll
28-Jan-2005 18:44 716,288 Wmadmoe.dll
28-Jan-2005 18:44 224,768 Wmasf.dll
28-Jan-2005 18:44 10.0.3790.3802 28,160 Wmdmlog.dll
28-Jan-2005 18:44 10.0.3790.3802 33,792 Wmdmps.dll
28-Jan-2005 18:44 335,872 Wmdrmdev.dll
28-Jan-2005 18:44 290,816 Wmdrmnet.dll
28-Jan-2005 18:44 150,016 Wmidx.dll
28-Jan-2005 18:44 1,027,072 Wmnetmgr.dll
28-Jan-2005 18:44 774,904 Wmsdmod.dll
28-Jan-2005 18:44 1,119,744 Wmsdmoe2.dll
28-Jan-2005 18:44 819,200 Wmsetsdk.exe
28-Jan-2005 18:44 413,944 Wmspdmod.dll
28-Jan-2005 18:44 940,544 Wmspdmoe.dll
28-Jan-2005 18:44 1,218,808 Wmvadvd.dll
28-Jan-2005 18:44 1,512,448 Wmvadve.dll
28-Jan-2005 18:44 2,370,296 Wmvcore.dll
28-Jan-2005 18:44 895,736 Wmvdmod.dll
28-Jan-2005 18:44 1,003,008 Wmvdmoe2.dll
28-Jan-2005 18:44 5.2.3802.3802 61,952 Wpdconns.dll
28-Jan-2005 18:44 5.2.3802.3802 114,176 Wpdmtp.dll
28-Jan-2005 18:44 5.2.3802.3802 331,776 Wpdmtpdr.dll
28-Jan-2005 18:44 5.2.3802.3802 66,560 Wpdmtpus.dll
28-Jan-2005 18:44 5.2.3802.3802 331,264 Wpdsp.dll
28-Jan-2005 18:44 5.2.3802.3802 10,752 Wpdtrace.dll
28-Jan-2005 18:44 5.2.3802.3802 18,944 Wpdusb.sys
28-Jan-2005 18:44 5.2.3802.3802 38,912 Wpd_ci.dll

Software update removal information

To remove this update, you must uninstall the Windows Media Format Runtime by using Add or Remove Programs.
During the license acquisition process, content services can detect whether their end users have updated their computers by checking for component versions. Using the Windows Media Rights Manager SDK on the licensing server, the content service can retrieve version information from the client and then determine how to continue. The license server can determine whether the client has the update by using one of the following methods:
  • Determine the version of the user's operating system.
    At first, the update to the Windows Media DRM system is available only to users of Microsoft Windows XP. Use client-side code to determine the version of the user's operating system.

    Content services may choose to issue licenses to computers that the update is not yet available for. Or, content services should notify their users that licenses will not be available until the DRM run-time component for their operating system becomes available.
  • Determine the version of the Windows Media Format run-time components on the client.
    Determine the version of the Windows Media Format run-time component that the user's player is based on. Use the WMRMChallenge.ClientVersion property to retrieve this value. An updated client has version To install the updated run-time components, redirect the user to the URL that is mentioned in the "More Information" section.
  • Determine the security version of the DRM component for individualization.
    Determine the security version of the DRM component. The version number indicates whether the client must individualize its player. Although the Windows Media Rights Manager SDK provides several ways to determine the security version, we recommend that you use the WMRMLicGen.GetClientVersion method because the resulting value is digitally signed. This digitally signed value cannot be tampered with. The value for the pvarVersion parameter of this method indicates the security version a.b in the format:
    a*256 + b (For example, a security version of 2.4 returns a value of 516.)
    An updated client has a security version of 2.5 or a later version. If you see a value that is less than or equal to 516, you know that the client requires individualization. You can redirect users to the following Microsoft Web site to initiate individualization:
Note Before the licensing servers can determine the versions of client components, you must update the configuration information on the licensing servers. To do this, visit the following Microsoft Web site and then click Download the latest License Server information: You must perform this update on each computer that is running Windows Media License Service.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates