UmdfKernelModeClientPolicy=AllowKernelModeClients Specifically, in the driver INF file, this entry is needed: Vendors that supply their own UMDF reader driver need a registry setting to allow PnP filter drivers to sit on top of the UMDF reflector.
HKLM, System\CurrentControlSet\Services\CertPropSvc,Start,0x00010001,2 HKLM, System\CurrentControlSet\Services\SCardSvr,Start,0x00010001,2 HKLM, Software\Microsoft\Cryptography\Calais\Readers, Vendors must also add a section to properly configure the smartcard services.
Vendors that supply their own reader drivers should make each driver a member of the SmartCardReader setup class in the INF Version Section of the driver's INF file. This section provides installation information that is specific to smart card reader drivers for Microsoft Windows.
