You can verify if buyback applies to a catalogue, on each catalogue's page.
When this option is active, the original Offerors of Royalty Interests (e.g. publisher, record label, artist, etc.) can choose to buy back all the Royalty Interest Shares from the market at a 15% premium on the volume weighted average price of the last 31 days. The original Offeror may buy back your entire Royalty Interests if this option is exercised. This may shorten the expiry of contract date. You may find more information in the catalogue's listing order.