Acting on a tip off, the police raided a house under Bypass police station and seized the books having a face value in the range of Rs 25-30 lakh.
Besides counterfeit books of NCERT and of popular authors, some pornographic books were also seized, a release from the Patna police said.
A printing machine, binding and cutting equipment were found in the house.
Six persons, including the house owner Ashok Kumar, were arrested from the spot, the release said.