restricted/unrestricted license in PIX 6.1

hi,
i have a customer with Cisco PIX 6.1(4).
he wants to upgrade to 7.0
i need to find out the type of license he has to find out how much
memory he needs

when he sends me the output of "show version",
i don't get the type of license,
(as in 6.3 e.g. : "This PIX has a Restricted (R) license".)

this is all I get:
cisco-pix sh ver

Cisco PIX Firewall Version 6.1(4)
..
Telecom, Cabling and VoIP continues...
Tags: telecom cabling fiber optic infrastructure LAN