This is a randomized, open-label, multicenter, Phase 2 clinical trial designed to evaluate the efficacy and safety of brentuximab vedotin in combination with rituximab and bendamustine for the treatment of patients with relapsed or refractory CD30-positive diffuse large B-cell lymphoma (DLBCL) after failure of second-line salvage therapy or as second-line treatment in patients ineligible for autologous stem cell transplant (ASCT).