Ability to set and retrieve New Altered Content Disclosure Flag

Is it possible to access, or edit the new Altered Content flag for videos?

Can't seem to recover the data using listVideos, or see anywhere in the documentation that I can set it on upload.

I expect to be able to set this flag on Upload.

print_r($youtubeService->videos->listVideos("contentDetails,fileDetails,status,topicDetails,snippet", array('id' => $videoId)) );

doesn't display anything related to the disclosure.