A finished video can still be useful after its subtitles are out of date. But when those captions are burned into the picture and the original editing project is unavailable, replacing them becomes difficult. Cropping changes the composition, while blur leaves an obvious patch. UnmarkAI starts with that problem: removing hardcoded subtitles and approved on-screen text with AI reconstruction. Creators can target one caption band, select several regions, or use full-frame detection when text changes position. They can preview the result while keeping the original audio and resolution. Subtitle removal is the core workflow. Translation and dubbing extend it: start with a cleaned source, then prepare a version for another language without old and new captions competing on screen. Our focus is practical reuse for creators, editors, and agencies working with videos they own or are authorized to edit. Every clip is different, so the workflow gives users control over the cleanup scope and a chance to review the complete result before publishing.