User blog comment:Semanticdrifter/Understanding Attribution on Wikia/@comment-1038387-20140109214638

A good read. I'm busy cleaning up some of the older pages on my wiki, because in the early days of DC wiki, everything was copied from wikipedia, often without attribution. The problem is that both our articles and the wikipedia article have evolved in 6-7 years (or the latter has been deleted), so it's difficult to determine what wasn't by us and what is. Some pages have an attribution template, but it's missing on a lot of pages.

At DC Database, we now have a zero tolerance policy towards copied content, with or without attribution. Since it's usually the latter, and often from sources outside wikia. Writing your own stuff always looks better.

As for images... for my wikis, this will mainly be the case with pictures of real people. They're taken from all over the internet, from sites with different licenses. Source links are often included (and often aren't) but that isn't enough in most cases. We've only had a couple of complaints so far and acted accordingly, but it's better to prevent that.