The Periyar Self-Respect Publicity Institution, which has so far failed in claiming copyright over EVR Periyar’s writings, has yet again failed to get the Madras high court nod to amend a suit it fled to include Periyar’s speeches and publications as well. Justice T Mathivanan said it would prejudice the respondents Periyar Dravidar Kazhagam (PDK) and its general secretary K Ramakrishnan.