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Hi Marc:

The Wi-Fi Alliance brand name WPA when found on the outside of packaging certifies that the WLAN product in the box will interoperate with other similarly branded WLAN products packaged at about the same time, give or take a year, using the two cipher suites WEP and TKIP, and with TKIP the two authentication and key management protocols 802.1X/EAP and PSK. Both of these cipher suites are based on the RC4 encryption algorithm.

WPA branded products may include other security features not included in the certification of interoperability, such as proprietary (pre-standard) CCMP based on AES.

The term WPA has myriad other meanings and is best avoided in technical discussions.
http://cwnp.com/phpBB2/viewtopic.php?t=2091

I hope this helps. Thanks. /criss