This addresses entirely the wrong question. By looking at it as a technical problem you're completely missing the broader ethical problem. Why was anyone allowe

This addresses entirely the wrong question. By looking at it as a technical problem you're completely missing the broader ethical problem. Why was anyone allowed by law to amass this amount of data? And why did PDS not take the security and privacy concerns of 1.2 billion people seriously enough to ensure the data was handled correctly? They obviously thought it was valuable enough to amass a huge database. Do they sell this to just anyone? If not, who can buy access to this data? How much does it cost, and what steps are involved in doing so? This makes me want to talk to a lawyer.