Next FOSDEM [1] will, again, have a security devroom, this time on the topic of "Operating System Security". We'd like to invite submissions of talks and presentations from developers, security researchers and other interested representatives of open source and free software and hardware projects. This is the call for talks and presentations that will take place in the Security devroom at FOSDEM 2019. Our topic this year: This year's topic is about the operating system components that make software secure and usable: security controls, security and usability, cryptography, secure communications etc. We welcome presentations which take into account these factors, and presentations that analyze other's solutions. For up-to-date submission and event information: https://github.com/security-devroom/fosdem-2019 The security devroom will be held on Sunday 3rd February 2019 in Brussels, Belgium at ULB. Feel free to forward this announcement to any relevant FOSS project mailing list. [1] https://fosdem.org/2019/