The SAS coverage includes the right to download and upgrade minor version levels (i.e within the 4.x release train in your case). The Q&A for 4.4 covers this. It hasn't been updated for 4.5 but the same information applies.
The license installed with 4.1 will continue to work on 4.5 after you upgrade the application.
4.5 is the latest and 4.6 it's right around the corner...if you are running new ips 7.3 you can't use cam to manage them until 4.6, seriously thought cisco security manager is the absolute worst package ever.....n
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...