There's a "sources" button at the bottom left that seems to appear at certain zoom levels.

> "vlive is an independent app and not an official app of any government, public authority or transport operator. It is not affiliated with, nor does it represent, NMBS/SNCB, De Lijn, STIB-MIVB or TEC. All data comes from their open data; where it matters, the official sources below are authoritative."