As an arbitrary example, note this page is CBC (Canadian Broadcasting Corporation) Radio's Standards & Practices on Investigative Journalism. Note the section on Data Journalism (which is silent on Open Data).
I'm looking for a similar document online for any major media outlet that clearly addresses Open Data in the contemporary sense.
Perhaps the example states something like: "When Open Data is used relating to a story, we provide a link to the data and the license, in accordance with the stated licensing terms of the provider". (I'm not a journalist but hopefully readers will get the idea. I'm coming at this from the Open Data perspective.)
Ideally, it might even say "We ask about Open Data as a part of normal protocol. If data is provided, but not as Open Data, we disclose that the story contains data which is not Open Data".