Jos Poortvliet

Jos Poortvliet is co-founder and Communications Director at Nextcloud. He is a long time technology enthusiast and all-things-open evangelist. He has previously been community manager at SUSE and worked as business consultant at government, finance and telecom companies in the Netherlands. He is based in Berlin and loves cooking for friends, family and colleagues.

Find him on https://jospoortvliet.com!

Sessions

Legal & Compliance

Beyond the license: measuring real openness in open source

Talk

17. March 2026, 10:35 - 11:05

Auditorium

Open source licenses like GPL or MIT matter, but ecosystem is what truly defines how open and sustainable a project is. Open source isn't always as open as it seems! There are many tactics beyond licensing to lock you in - and copyleft isn't always better than permissive, or vice-versa.