This often stands for "Taishikan" or a similar group known for providing high-quality subtitles (hardcoded or soft-coded) for the Chinese-speaking audience.
Oppenheimer (2023) Format: 1080p BluRay Audio: DDP5.1 (Dolby Digital Plus Surround Sound) Source: CM (scene/release group) – TSK Oppenheimer.2023.1080p.BluRay.DDP5.1 -CM- TSK.mp4
The naming follows standard digital media conventions used by online release groups to identify the video and audio quality of the file: Filename Breakdown Oppenheimer (2023) : The movie title and its theatrical release year. This often stands for "Taishikan" or a similar
