University researchers want the government of Country Y to invest in the creation of a database...

University researchers want the government of Country Y to invest in the creation of a database of information about the lives of people who have lived in the country during the past 300 years. 

Population information is based on official registers of data about individual people. This data will include the person's name, the dates they were born, the names of their parents, the names of partners if they decide to marry, the names and dates of birth of their children and, finally, the person's date of death and cause of death. In the past this information was recorded on paper by hand, but today there are an increasing number of computerised databases that record this information. This will include data about the 58 million people alive in Country Y at the moment.

Additional data may come from government questionnaires that are circulated once every 10 years and completed by every household in Country Y all on the same day of that year. 

The system is intended to help the researchers analyse demographic change but it will also be useful to people who want to identify who their ancestors were and the links between families.

What THREE obstacles will the University researchers face in developing and implementing this system?