But there are two crucial points here. First , information gleaned from public records of any sort is NOT protected under copyright law when someone copies it down onto a standard genealogy chart or enters it into a database.
Vital records are public records.
Court records are public records. Facts gleaned from tombstone inscriptions are public records. A wealth of other sources can provide the researcher with facts that also are public records. Second , copyright law does NOT protect the data content of anything published. Data can be acquired, compiled, justified, and cited.