Hi Lawrence,
I downloaded a PDF from the following url:
And one paragraph of the PDF says:
The Portal wiki is not a new development. SAP integrated a product from a third-party vendor with this third-party-wiki software as a basis, SAP created a SAP specific wiki which is integrated into SAP NetWeaver Portal. For customers no extra license is necessary, wikis are part of the NW license.
So I thought it was a third-party vendor product. My colleague sent a message to SAP for this question today. I will update you if we get anything new.
Thanks:)
David