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I think any time you've got a story based on a true story, no matter how accurate it is, obviously it's still fictitious.

"Director John Lee Hancock Talks SAVING MR. BANKS, Why He Takes Time Between Projects, Working with Disney’s Legal Department, and THE AMERICAN CAN". Interview with Steve 'Frosty' Weintraub, collider.com. December 18, 2013.
I think any time you've got a story based on a true story, no matter how accurate it is, obviously it's still fictitious.