My guess, based on their secretive response, is that they are relying on the native 128 bit WEP encryption built into the standard.
If they were using LEAP, then they would have no real issue telling you as just knowing that LEAP is in use, will give nothing away security wise.
The way LEAP works is it takes the WEP encryption keys and dynamically changes them on the fly so that while a hacker could hack several packets and decrypt them (which is a fairly time consuming process), the encryption keys are changed (at random or prefined time intervals) making the hacker have to start all over again with the next set of packets.
Check this article for more information:
http://www.cisco.com/warp/public/cc/...t/a350w_ov.htm
or
http://techupdate.zdnet.com/techupda...700806,00.html
hope this helps