diff --git a/devine/commands/util.py b/devine/commands/util.py
index 69e08bf..9a8ed18 100644
--- a/devine/commands/util.py
+++ b/devine/commands/util.py
@@ -102,3 +102,72 @@ def crop(path: Path, aspect: str, letter: bool, offset: int, preview: bool) -> N
             if ffmpeg_call.stdout:
                 ffmpeg_call.stdout.close()
             ffmpeg_call.wait()
+
+
+@util.command(name="range")
+@click.argument("path", type=Path)
+@click.option("--full/--limited", is_flag=True,
+              help="Full: 0..255, Limited: 16..235 (16..240 YUV luma)")
+@click.option("-p", "--preview", is_flag=True, default=False,
+              help="Instantly preview the newly-set video range in MPV (or ffplay if mpv is unavailable).")
+def range_(path: Path, full: bool, preview: bool) -> None:
+    """
+    Losslessly set the Video Range flag to full or limited at the bit-stream level.
+    You may provide a path to a file, or a folder of mkv and/or mp4 files.
+
+    If you ever notice blacks not being quite black, and whites not being quite white,
+    then you're video may have the range set to the wrong value. Flip its range to the
+    opposite value and see if that fixes it.
+    """
+    executable = get_binary_path("ffmpeg")
+    if not executable:
+        raise click.ClickException("FFmpeg executable \"ffmpeg\" not found but is required.")
+
+    if path.is_dir():
+        paths = list(path.glob("*.mkv")) + list(path.glob("*.mp4"))
+    else:
+        paths = [path]
+    for video_path in paths:
+        try:
+            video_track = next(iter(MediaInfo.parse(video_path).video_tracks or []))
+        except StopIteration:
+            raise click.ClickException("There's no video tracks in the provided file.")
+
+        metadata_key = {
+            "HEVC": "hevc_metadata",
+            "AVC": "h264_metadata"
+        }.get(video_track.commercial_name)
+        if not metadata_key:
+            raise click.ClickException(f"{video_track.commercial_name} Codec not supported.")
+
+        if preview:
+            out_path = ["-f", "mpegts", "-"]  # pipe
+        else:
+            out_path = [str(video_path.with_stem(".".join(filter(bool, [
+                video_path.stem,
+                video_track.language,
+                "range",
+                ["limited", "full"][full]
+            ]))).with_suffix({
+                # ffmpeg's MKV muxer does not yet support HDR
+                "HEVC": ".h265",
+                "AVC": ".h264"
+            }.get(video_track.commercial_name, ".mp4")))]
+
+        ffmpeg_call = subprocess.Popen([
+            executable, "-y",
+            "-i", str(video_path),
+            "-map", "0:v:0",
+            "-c", "copy",
+            "-bsf:v", f"{metadata_key}=video_full_range_flag={int(full)}"
+        ] + out_path, stdout=subprocess.PIPE)
+        try:
+            if preview:
+                previewer = get_binary_path("mpv", "ffplay")
+                if not previewer:
+                    raise click.ClickException("MPV/FFplay executables weren't found but are required for previewing.")
+                subprocess.Popen((previewer, "-"), stdin=ffmpeg_call.stdout)
+        finally:
+            if ffmpeg_call.stdout:
+                ffmpeg_call.stdout.close()
+            ffmpeg_call.wait()
diff --git a/devine/core/drm/widevine.py b/devine/core/drm/widevine.py
index 841078f..5020d03 100644
--- a/devine/core/drm/widevine.py
+++ b/devine/core/drm/widevine.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import base64
 import subprocess
 import sys
-from typing import Any, Optional, Union, Callable
+from typing import Any, Callable, Optional, Union
 from uuid import UUID
 
 import m3u8
@@ -199,7 +199,7 @@ class Widevine:
                         for i, (kid, key) in enumerate(self.content_keys.items())
                     ],
                     *[
-                        # Apple TV+ needs this as their files do not use the KID supplied in it's manifest
+                        # some services use a blank KID on the file, but real KID for license server
                         "label={}:key_id={}:key={}".format(i, "00" * 16, key.lower())
                         for i, (kid, key) in enumerate(self.content_keys.items(), len(self.content_keys))
                     ]
diff --git a/devine/core/tracks/track.py b/devine/core/tracks/track.py
index 822b815..4cf2ed5 100644
--- a/devine/core/tracks/track.py
+++ b/devine/core/tracks/track.py
@@ -240,7 +240,7 @@ class Track:
             with open(save_path, "wb") as f:
                 for file in sorted(segments_dir.iterdir()):
                     data = file.read_bytes()
-                    # Apple TV+ needs this done to fix audio decryption
+                    # fix audio decryption
                     data = re.sub(b"(tfhd\x00\x02\x00\x1a\x00\x00\x00\x01\x00\x00\x00)\x02", b"\\g<1>\x01", data)
                     f.write(data)
                     file.unlink()  # delete, we don't need it anymore