1) is there an API method to capture/store the thumbnail image of the YouTube video at 3:59 which is not the autogenerated thumbnail or the cover thumbnail uploaded by original uploader? There does not seem to be any established answer on SO
2) if (1) is not possible, is it legal for me to download the original video, grab the thumbnails of at the desired timeframe, and use those thumbnails on my app giving credit and attribution to the original source?
