Javed Hashmi was arrested Oct. 29 for producing a letter in Parliament, which he claimed he had received from army officers. The letter expressed dissatisfaction with the policies of President Pervez Musharraf, particularly his support of the U.S.-led war against the al-Qaida terrorist network.
The Pakistani government said Hashmi faked the letter and was using it to encourage mutiny within the army.
Hashmi, a leader of the opposition Muslim League party, denied the charges. He can appeal his conviction and sentence to the country's Supreme Court.
Hashmi was a minister in the government of former Prime Minister Nawaz Sharif, who was deposed by Musharraf in October 1999.