3 years after Supreme Court decision, TRREB still fighting over MLS data Three years after losing a prolonged court battle over the restriction of housing data, the Toronto Regional Real Estate Board continues to pursue legal action against companies it accuses of illegally accessing its Multiple Listing Service system. Social Sharing Posted: Jul 16, 2021 6:02 PM ET | Last Updated: July 16 TRREB's MLS system contains listings, sales figures, archival info and neighbourhood descriptions entered by real estate agents as homes are put on the market and sold.(Michael Wilson/CBC) Three years after losing a prolonged court battle over the restriction of housing data, the Toronto Regional Real Estate Board continues to pursue legal action against companies it accuses of illegally accessing its Multiple Listing Service system.