Short Answer: creation = copyright/ownership; if DAR created it don't use it without their permission.
Longer Answer: I have not needed to use their site nor have I looked at their policies but I would assume the DAR proprietary information would include, without limitation, the organization name itself, any identification numbers they assign, the content of any internal communications, membership information, etc. In broadest terms they could have copyright over anything they created including how the facts are organized, presented, or expressed.
There is however lots of gray area here - for example, while they can claim copyright over how information is organized and presented, simply organizing information alphabetically or chronologically is considered 'obvious' and is not copyright-able.
Similarly, the actual facts about people (names, places, dates, etc.) are not subject to copyright, but how the facts are expressed (the overall composition of paragraphs or a document including word choice, sentence structure, sequencing, etc.) may be subject to copyright.
An image of a form (such as a membership application) even when blank would not be OK - they created and therefore own the layout of the form.
They could, in theory, even have copyright over how citations are formatted (i.e. "the presentation of a citation") if they have created their own unique DAR citation style - the content of the citation however would still not be copyright-able as the author, title, publisher, and page number are facts.