This is likely a specialized internal tracking code or a "release group" tag used by the site to categorize their specific encodes. 2021: Refers to the release year of the content.
Slowly, the adrenaline faded, replaced by a cold dread. He stood up, grabbing his phone to use as a flashlight. He shined it toward the bookshelf where the hidden camera angle had been. IMVBDXSKMHD -2021- www.SkymoviesHD.Red Unrated ...