Union minister Prakash Javadekar said, "No proof to be given to anyone during the process. Whatever you will say would be correct."

"All states will use NPR data," said the minister adding that no biometrics will be required and it will apply to all Indian citizens. "Rs 1,300 crore has been allocated to NPR and Census," he said.

It will be conducted by the Office of the Registrar General of India (RGI) under Union Home Ministry and will be done before 2021 Census.

As per the proposal, the exercise to update NPR would be held between April and September 2020 in all states and Union Territories.

NPR data was first collected in 2010, ahead of Census 2011. NPR is a register of usual residents of the country.

It is being prepared at the local (village/sub-town), subdistrict, district, state and national level under provisions of the Citizenship Act, 1955 and the Citizenship (Registration of Citizens and Issue of National Identity Cards) Rules, 2003.