Jon Snow 'apologizes' for 'Game of Thrones' in deepfake video

The "apology" for season 8 offers a new warning about so-called deepfake videos, which appear to be authentic but are actually fabrications.
2:28 | 06/17/19

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Transcript for Jon Snow 'apologizes' for 'Game of Thrones' in deepfake video
We have a new warning about so-called deepfake videos. They're viral videos that appear to be authentic but they are actually complete fabrications. The latest one appears to show the actor who plays Jon snow on "Game of thrones" apologizing for the final season. Zachary kiesch has more on that. Reporter: It's the apology that no one saw coming. I'm sorry we wrote this in like six days or something. Now, let us burn the script of season 8. Reporter: Over the weekend a doctored "Game of thrones" clip getting more than a million YouTube views. The video shows character Jon snow issuing an on screen mea culpa for that controversial final season. I have more lines in this video than I had in the last Reporter: This altered video is just the most recent of what are being called deepfakes, viral videos that look and feel real but aren't. A deepfake is an A.I. Generated piece of video content that presents itself as if it's a real video of a real person Reporter: Bill posters is an artist who creates deepfakes like this one of mark Zuckerberg, not to fool people but to show how easy it is and to educate folks on the dangers. The spread of doctored videos are prompting louder conversations about whether the face altering technology could be dangerous if misused. Some point to this clip of Nancy Pelosi, it's been slowed down to make it appear as though she's slurring her words. We want to give this president the opportunity to do something historic. Reporter: The real video is a different story. We want to give this president the opportunity to do something historic. The majority of deepfake videos don't simulate or don't re-create the whole of the video content. I mean, 80% or 90% of the video is actually genuine, a copy of the original source video. What they tend to change is the area around the mouth, the cheeks and their chin so it's really good to just pay attention to looking at those areas of the video to see if you can see any of the frames out of sync. Posters suggested if you find a video that seems sensational or too good to be true, do your homework and search for other variations. I've seen this time and time again. Alert folks or let Facebook know. Got to think critically and double-check on some of this stuff. Thank you. Thanks, Zachary. A special father's day --

This transcript has been automatically generated and may not be 100% accurate.

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