SoftRAID 3.6.5 kernel extension in Leopard

I came across a kernel extension for SoftRAID 3.6.5, from [Bad link] in Leopard's /System/Library/Extensions folder. I found the version in the SoftRAID.kext's Info.plist file, and it really truly does appear to be SoftRAID, based on the copyright and the bundle identifier and so on.

This is notable simply because it's included (although I don't know how it's being used, if at all) and it is also a newer version than I've seen press releases for.