Hi,
> I was looking at the unsupported list:
> http://www.reactivated.net/fprint/wiki/Unsupported_devices
Wiki is outdated and code moved to freedesktop.org. You can get the
latest version at :
http://cgit.freedesktop.org/libfprint/libfprint/
> I am interested in the URU 4500 reader. Has anyone worked on it yet?
This device is still not supported by libfprint. A few people were
working on it more than one year ago, but I don't know if they managed
to get the device working. For more details, refer to:
http://lists.reactivated.net/pipermail/fprint/2009-May/001184.html
> If I were to create a driver for this device, where do I begin from?
> Should I hack the Linux driver from Vendor?
If you own that reader, you can log traffic on the USB bus while you're
using it with the official driver. However, as image seems to be
encrypted, you will need to find a way to disable encryption first. As
URU 4500 seems to be similar to URU 4000, you can use code from the
uru4000 libfprint driver code as a start.
Another (more difficult and time-consuming) possibility would be do
clean room design (http://en.wikipedia.org/wiki/Clean_room_design) and
disassemble the official driver, but in case you do so, you cannot
directly write code for libfprint, unless you want to run into legal
problems (see the aforementioned Wikipedia article).

Regards.
--
Hugo Grostabussiat
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