As a long time user and contributor to the FindAGrave website, I must point out, that copyright issues are outlined in the FindAGrave FAQ section. 

In short, the website's administrators contend that any "original" photo, taken or created by any person, is considered to be a copyright protected item.  Other people who wish to use that person's personally created photo, must ask for the photographers permission first, before reposting the photo anyplace else online or for their personal or public use.  

This is as it pertains to photos of monument stones and family photos of the subjects in the memorials.  To clarify, this rule has to do more with protecting the original photographer who personally created a specific image of a monument stone...and not the data that is listed on the stone, which is, in most cases, public knowledge.