Talisman Energy Inc. said on Monday it does not know the origin of a memo that human rights groups say shows the Canadian oil producer asked Sudan's army in 1999 to remove villages near its oil facilities in the war-torn African country...Human rights groups have filed the document as evidence in U.S. federal court in a lawsuit alleging Talisman has conspired with the Sudanese government in ethnic cleansing that killed or removed non-Muslim civilians living in proximity to Sudan's oil production regions.