Last year, I wrote about how Authentec wouldn't support their fingerprint readers on Linux. I've been chatting to the good folk at Authentec, and they've agreed to release the specification documents!
So if you want to code up an interface for the AES2810 or AES2550 you can!
A word of note, the best way to get the latest version of these documents is to register for the Authentec Developer Program. You then need to drop the team a note asking to get access to these specific documents - devportal AT authentec.com
That way you will get informed when there is a new release of other sensor's specs or updates.
So, here are the documents :-)
NB, I specifically asked the development team about sharing these files. They said:
Since we have released the documents without requiring any NDA or other such agreement signing we can't prevent you from sharing them.