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The original L4 (I believe) wasn't commercially available und sel4 is GPL licensed. Minix has a BSD license, so maybe that's why

• LeFantome 2y ago
  100% because of the license
• Rochus 2y ago
  The original L4 was written in assembler and replaced by different other implementations long before the ME platform was developed. Pistachio was in development around that time and available under BSD.