The file Thunderstruck.2012.1080p.BluRay.x264-DATA is almost exclusively distributed via unauthorized channels (torrents, Usenet, private trackers). Owning the physical Blu-ray and making a personal backup is legal in some jurisdictions (e.g., fair use in the US for format shifting – though circumventing CSS encryption violates the DMCA). Downloading from public trackers is copyright infringement in most countries.
Once you obtain the .mkv or folder of .rXX archives (if split), follow these steps: Thunderstruck.2012.1080p.BluRay.x264-DATA -Publ...
A genuine -DATA release will have:
(Without the "-Publ..." extension, which may be an artifact from a torrent site or usenet indexer.) The file Thunderstruck