Linked by Thom Holwerda on Sat 21st Jan 2006 22:42 UTC, submitted by PlatformAgnostic
Windows "With little fanfare, Microsoft just announced that the x64 version of Windows Vista will require all kernel-mode code to be digitally signed. This is very different than the current WHQL program, where the user ultimately decides how they want to handle unsigned drivers. Vista driver developers must obtain a Publisher Identity Certificate (PIC) from Microsoft. Microsoft says they won't charge for it, but they require that you have a Class 3 Commercial Software Publisher Certificate from Verisign. This costs $500 [EUR 412] per year, and as the name implies, is only available to commercial entities."
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You can write (not particularly well-performing) file-system drivers in usermode that function by opening the drive in RAW mode and reading the data off of it. There's an explorer interface that allows you to hook your user-mode file system to the folder browsers. I'm not sure if/how it works for purposes other than browsing and copying files (I doubt you'll be able to execute anything from the drive or memory-map the files).

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