Buy the Planet Earth Blu-ray box set. You can then use legal software (like MakeMKV) to create your own MKV file for personal backup. This is the to obtain a “verified” MKV file.
When you see terms like these in a file name, they carry specific meanings regarding the quality of the video: vegamoviesnl planet earth s01e01mkv verified
For tech-savvy users who want a verified file without breaking the law: Buy the Planet Earth Blu-ray box set