libusb0.sys driver signing clarification

Hello all,

I'm using libusb-win32 for one of the projects that I'm currently involved
in. I'm working on Windows 7 machine as well as on Windows 8.1 machine.

I used the 'inf-wizard' to generate the inf file for the driver. I used the
inf file to try installing the driver in both Win7 and Win8.1.

In Windows 7 machine I can install the driver by ignoring the warning the
operating system gives. But in Windows 8.1 I cannot install the driver at
all, it fails telling that the driver is not signed.

Then I used Zadig to generate the related files. I noticed that a '.cat'
file is also generated through Zadig. I tried this on Win8.1 and I
extracted the driver files and installed the driver manually and
flawlessly, without the driver signature error as well.

But when I used those files (with cat file) on windows 7 machine it still
gave the unsigned driver issue.

Then I generated the cat file in windows 7 and istalled the driver use that
package and i did not get the driver signature error. But those files do
not work in Win8.1 environment or any other machine with Win7 installed.

The questions I have is,

1). Is there any way to avoid driver unsigned warning?
2). Is the '.cat' file generated through Zadig for only one machine?
3). Is there any way to install the libusb-win32 driver on more than one
machines, using same set of files (In windows 7 and windows 8.1)?
4). If we want to use this driver for our clients do we need to sign it as
well?

Thank you,

Best Regards,
Pradeepa Senanayake.

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