I notice that some sites give access to Census returns, GRO records (for the UK) etc eg this one has a long list of databases you can search https://www.familyrelatives.com/post_search.php.
Does anyone know how they get the data?
For example, does the GRO lease it to them or offer an open source feed so they can offer it via their sites?
I have a small genealogy product and I'm interested in hosting some of the big data sets (Census, BMD, military records etc) as a service for my users but I don't know how these other sites get it.
Did they purchase it from the government?
Transcribe it themselves?
Get it from an open source API?