Saleh's immunity from prosecution, part of a deal put together to persuade him to resign, has angered protesters who have accused security forces controlled by Saleh and his aides of killing hundreds of demonstrators in the past year.
Opposition groups not involved in the power transition deal, sponsored by Yemen's wealthier neighbours and backed by the United States, questioned parliament's authority to approve the immunity law.
"We are not bound by the immunity law because it deals only with the (mainstream opposition) Joint Meeting Parties and the (ruling) People's Congress Party, not us," said Mani al-Matari, a leader of a committee set up by youths who led nearly a year of protests against Saleh.
"We will continue protesting until all of the revolution's goals are achieved. The parliament has no legitimacy and we are holding on to international law."
The immunity law, passed on Saturday by a parliamentary majority, does not give full protection to Saleh's aides, as an amendment leaves them vulnerable to prosecution for crimes considered "terrorist acts".
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