← Marius Kieler

Writing

Mostly notes from taking something apart: streaming DRM, exam monitoring software, my own network. I write one when I've spent long enough on a problem that someone else should get the answer for free.

November 4, 2026 · 2 min read

The CAPTCHA is on the wrong door

I was trying to collect public ratings, not prove I could operate a browser. Then I asked whether the service had an app.

reverse-engineering, mobile, data, recommender

October 20, 2026 · 2 min read

I tried to fix my friend's internet and logged into his ISP

One of my close friends was having trouble with his internet, so I was helping him get his Chromecast working. I ended up logged into his ISP's router.

networking, security, ubiquiti

October 16, 2026 · 3 min read

Why I keep coming back to Nix and VMs

I quit Nix and spent years joking about hating it. Then an agent started doing my infra work. Now my side projects run in a NixOS VM at home.

homelab, nixos, kubernetes, k3s, gitops, cloudflare, netbird, self-hosting

October 8, 2026 · Morningscore

How Google Gave Rank Trackers Truncated Results for a Week

Research and writing for Morningscore, investigating incomplete Google results and their effect on rank tracking.

March 18, 2026 · 7 min read

I blamed my ISP for three months. It was my router.

Upgraded to a UniFi Express 7, got terrible performance, filed an ISP support ticket, and eventually realized it was my own network. Switched to OPNsense and got full line rate and a bufferbloat A.

networking, firewall, performance, unifi, opnsense, bufferbloat

November 17, 2025 · 5 min read

TV2Play's 720p desktop cap lives in the client

TV2Play limits desktop browsers to 720p by hardcoding the resolution in the API request, instead of using Widevine security levels. The license server issues a valid 4K key anyway, so the cap is purely client-side and mostly affects paying desktop users.

reverse-engineering, streaming, drm

May 12, 2024 · 5 min read

ExamCookie: the illusion of exam integrity 5 years later

ExamCookie is the anti-cheating software Danish students have to run during exams. Five years after secret.club took it apart, I looked at what changed. Not much.

reverse-engineering, security

Follow the RSS feed or find my code on GitHub.