[Ger-Poland-Volhynia] documents why are some blocked out?

[kitchur at mymts.net]

I've seen alot of birth/marriage/death records like this over the last couple of weeks. Curious, Why would they have covered up 
some of the information? 

http://agadd.home.net.pl/metrykalia/439/sygn.%20209/pages/PL_1_439_209_0062.htm