: The show title ( Vikings ), Season 4, Episode 3 ("Mercy").
: The name of the "release group" that originally encoded or ripped the file.
: The distribution group or site where the file was uploaded. -1 : likely a part number or version indicator.
The specific text "Watch GR Vikings s04e03 hdtv x264-fleet[eztv]-1" appears to be a or release tag for a pirated episode of a television show, likely Vikings .