As Abacus states above, most people these days will use a WPA variation of encryption on their wireless routers as WEP is considered out-of-date and open to possible hacking threats. It is not about stealing anything off your keyboard, actually it is about protecting your entire network from possible intrusion.
Until now, the PSR-S910 and PSR-S710 (CVP-500 series also has firmware update supporting WPA etc) couldn't gain access wirelessly to a WPA encrypted network unless you altered your router's settings to WEP or worse to encryption off.
This is a feature owners have been asking for on YPKO, so it is indeed a welcome addition.