Software like Adobe Premiere or HandBrake often defaults to the .m4v extension when exporting or converting mobile-friendly videos.
Many M4V files purchased from the iTunes Store are protected by FairPlay DRM to prevent unauthorized copying. Kati-1.m4v
Tutorials for the CATIA 3D design software often use naming conventions like "Kati" or "CAT" followed by lesson numbers (e.g., "Kati-1" for lesson 1). Software like Adobe Premiere or HandBrake often defaults