Dr. Percy Yutar was chief prosecutor at the Rivonia Trial. His copies of trial records and working documents were sold to the Brenthurst Library, the private library of the the Oppenheimer family, in the 1990s. The documents were donated by the Oppenheimer family to the National Archives and Record Service in November 2008. The collection was digitised in 2012, with one set of copies being retained by the National Archives, one by the Brenthurst Library, and another set by the NMCM. The ordering and numbering established by the Brenthurst Library