Why is "renameIntegoContentBarrier" in the log of OSX install log ?

Question

While I was searching for "Intego" on my MBP's disk, to clean up stuff left behind by Intego's VirusBarrier, I noticed that "Intego" was mentioned in the Install.log that I saved from when I reinstalled OSX (erase and install of OSX 10.5.6.)
Below is a small excerpt from the OSX install log.
Notice the "renameIntegoContentBarrierPre10.4.3".
Does anybody know why Intego is a part of OSX install? -- What that script might be doing?
Is OSX's parental controls authored by Intego?
May 1 04:35:56 localhost root[296]: Begin script: removeJava1.6DevPreview
May 1 04:35:56 localhost root[302]: End script: removeJava1.6DevPreview
May 1 04:35:56 localhost root[303]: Begin script: renameIntegoContentBarrierPre10.4.3
May 1 04:35:56 localhost root[305]: End script: renameIntegoContentBarrierPre10.4.3
May 1 04:35:56 localhost root[306]: Begin script: runChrooted.sh
May 1 04:36:02 localhost root[329]: End script: runChrooted.sh
May 1 04:36:02 localhost root[330]: Begin script: upgradeProKit
May 1 04:36:02 localhost root[332]: End script: upgradeProKit
May 1 04:36:02 localhost root[333]: 13 Install Scripts run.
May 1 04:36:02 localhost OSInstaller[157]: Performing post-extraction actions
May 1 04:36:02 localhost OSInstaller[157]: Finishing receipt
.....

Answer 1

I have not reinstalled the OS on any of my Intel Macs so I can't meaningfully compare my install logs to yours, but at this point my best guess is that the 'renameIntegoContentBarrierPre10.4.3' script is something Apple included in the installer that was meant to disable or mark older versions of Intego ContentBarrier (prior to version 10.4.3?) for the "Upgrade" or "Archive & Install" Leopard install methods. That guess is based on:
1. It isn't unusual for Apple to include a bunch of installer scripts that check for special circumstances & do nothing unless they find them
2. A lot of installer scripts run regardless of the install method chosen
3. There were known problems with older versions of Intego ContentBarrier (see Mac OS X 10.5: Unable to quit running application or restart; "The application cannot be launched, -600" alert)
4. Apple installers have been known to disable third party items that conflict with the installed OS (some versions of APE, for example)
If I'm right about this, someone who has reinstalled the OS using a 10.5.6 installer on a similar model should find the same log entries you did. Maybe someone who has will see this, check their log, & post info that will confirm my theory ... or show that it is wrong.