Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyrighted works can not be copied or re-published!
Please stick to the following rules
Ask permission before using data or at least notify the author, chances are the author will give permission, which can lead to more data exchange!
Do not use this data until you have checked it, preferably at the source (the archives)!
State from whom you have copied the data and ideally also his/her original source!