I don't know what the licensing is and I haven't tried it myself, but I've heard good things about these folks:

http://www.digitalpersona.com/


>Does anyone have any recommendations or good experiences with using any particular Biometric (fingerprint reader, smart card etc.) SDK in VFP?
>
>Preferably with no runtime royalty...... I don't mind paying for developer licenses, but individual runtime licenses are generally unworkable given the license and deployment scheme we use for our own software products.
>
>I am being asked to consider integrating login/transaction biometric security into our product(s).
>
>Any suggestions are appreciated.
>
>Thanks
>
>Alec