Bunch of uptight chaps make a documentary (Expelled) about how academia is repressing the rough and tumble of free speech about biological evolution (they think evolution is a pernicious myth).
Same bunch of uptight chaps hold “press conferences” where instead of wallowing joyfully in the rough and tumble of free speech by actually answering questions from the media freely, they make the press sign a non-disclosure agreement((in the Get.The.Concept, Failing. To. Dept ~File)) and submit questions in writing, and then only have their PR person read out the questions that are sympathetic.
Via Pharyngula, which has more detail and a whole backlog of posts about the doco in question.