Dear RIOTers, I just found the eCos license:  http://ecos.sourceware.org/license-overview.html
It's basically a modified version of the GPL with linker exception. The interesting point: it is officially recognised as a GPL-compatible Free Software License: https://www.gnu.org/licenses/license-list.html#eCos20 and it seems to enable exactly what most of us want for RIOT: it makes it possible to implement proprietary applications on top of the OS, but any changes to the OS have to be made freely available. It seems also possibly to apply this exception on device drivers if this driver is implemented in a particular way. A very quick search revealed immediately one commercial user of this rule: https://help.eyefi.com/hc/en-us/articles/301754-eCos-Open-Source-License To me this looks very promising. What do you think? Cheers, Oleg  eCos is another "free open source real-time operating system intended for embedded applications." -- The problem with TCP jokes is that people keep retelling them slower until you get them.
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