"read-only type license" -- that's a bit too strong wording.

OTTAWA, September 12, 2007 — [...] QNX Software Systems today announced that it is opening access to the source code of its QNX® Neutrino® realtime operating system (RTOS) under a new hybrid software licensing arrangement.

Effective immediately, QNX will make source code for its [...] microkernel-based OS available for download. The first source release includes the code to the QNX Neutrino microkernel, the base C library, and a variety of board support packages (BSPs) for popular embedded and computing hardware.

Not only can developers view the QNX Neutrino source code, but they can improve, modify, or extend that code for their own purposes or for the QNX community at large.