Content Scramble System (CSS) — Wikipedia
experimentation, however note especially that we support larger regions (up
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chunk[i] = (offset + i) & 0xFF;
The FastAPI webapp Python code is good with logical integration of HTMX routes and partials, but Opus 4.5 had fun with the “YouTube-themed” aspect of the prompt: the video thumbnail simulates a YouTube thumbnail with video duration that loads an embedded video player when clicked! The full code is open-source in this GitHub repository.