Vellum 1.1.1 Vellum firmware is proprietary. It is linked with the libraries below. epdiy - LGPL-3.0 - https://github.com/vroland/epdiy (LilyGo T5S3-4.7-e-paper-PRO lib/epdiy) Arduino-ESP32 core 2.0.14 (framework-arduinoespressif32 3.20014.231204) - LGPL-2.1 ESP-IDF 4.4 components - Apache-2.0 Monocypher 4.0.2 - CC0-1.0 or BSD-2-Clause - https://monocypher.org QRCode (ricmoo) - MIT Berkeley Mono (licensed typeface, rasterised), Source Serif 4 - SIL OFL 1.1 Relinking: relink-1.1.1.tar.gz holds the object files of this build, the library archives it linked, and link-command.txt. Replace an LGPL library's archive with your modified build and run the command from that folder. Map data (downloaded separately): (c) OpenStreetMap contributors, ODbL 1.0.