I know that charts and graphs, etc. are not protected by copyright.
But I can still put something like © x.com next to the title of the chart. I want to do this so that people can still copy and use the chart, but not pass it off as their own - since the chart presents some information that is not immediately obvious from the available data and not everyone who saw that data would have thought of computing/deriving that information.
The question is, is it a good idea to do this? Or does it appear too miserly (for lack of a better word) to try to put a © notice on something that's not legally copyrightable. This is not a legal question obviously.