Several years ago, one of the "BIG GUYS" online threatened to sue me for $150,000
(and no, it wasn't Epi) because my Christmas cookie website had the same recipe that their cookie section did. They said it was "theirs" and that I was infringing on their copyright and that I must remove the recipe at once or they'd sue me for big bucks.
While this was alarming, I let them know that I knew about copyright law and the stance on recipes. If that weren't enough, I had the original source of the recipe (a 1960's out-of-print cookbook) and scanned the page and sent it to them and told them, even assuming you could copyright a recipe, how can you claim it's yours when it looks to me like it's from Better Homes and Gardens. Should BHG sue us both?
They told me I "seemed well informed" and that in light of the information I provided them it seemed appropriate to drop the issue.
The thing is, they knew very well that recipes can't be copyrighted, but they were counting on the "little guy" not knowing and employing bullying scare tactics to eliminate the competition.
Didn't work. ;o)
I have since become much more conscientious about mentioning my sources. I originally made the site for myself and my family and didn't think another soul would ever see it, so I never bothered to write down stuff like that (this was back in the prehistoric age - 1995). When the site got big enough to attract the attention of the "big guy" mentioned above, I realized I had to be more professional about it.
Now I only add recipes submitted by users and it's rare that I get one worth adding to the site.