BD (Blu-Ray Disc). Indicates the video was ripped from a high-quality physical disc, usually featuring superior picture quality compared to streaming rips (WEB-DL).
The legality of downloading such files depends on your local copyright laws regarding digital backups. If you can clarify: What show or movie is this for?
Files found with this type of naming convention are often located on third-party file-sharing sites. gatecima-com-etat-09-bd-1080p-mkv
Based on your request, "gatecima-com-etat-09-bd-1080p-mkv" appears to be a specific filename for a (likely MKV format) of an anime or media title.
Ensure you have updated antivirus software when downloading content. BD (Blu-Ray Disc)
Are you having issues the file (e.g., Codec issues, Subtitles not working)?
Here is a report based on standard file conventions for this type of query: If you can clarify: What show or movie is this for
1080p MKV (Matroska Video File). This typically indicates high-definition, high-quality video, often with multiple audio tracks or subtitles embedded.