And Then There Were None 2015 Vietsub Patched ((exclusive)) [Genuine]

This is exactly what uploaders mean by "patched."

The term typically appears on community sharing platforms and indicates:

The 2015 BBC broadcast had slightly different frame rates (24fps vs. 25fps) across UK TV and international BluRay releases. Many early Vietsub files were created using a 2GB AVI rip. Later, when fans downloaded a 4GB MKV remux, the subtitles would drift further out of sync every 10 minutes.