QEMU [SEP] license
for kernel-mode and real-mode code. KQEMU could execute code from many guest OSes even if the host CPU did not support hardware-assisted virtualization. KQEMU was initially a closed-source product available free of charge, but starting from version 1.3.0pre10, it was relicensed under the GNU General Public License. QEMU versions starting with 0.12.0 () support large memory which makes them incompatible with KQEMU. Newer releases of QEMU have completely removed support for KQEMU.
"QVM86" was a GNU GPLv2 licensed drop-in
do emulation for user-level processes, allowing applications compiled for one architecture to run on another.
Licensing.
QEMU was written by Fabrice Bellard and is free software, mainly licensed under the GNU General Public License (GPL for short). Various parts are released under the BSD license, GNU Lesser General Public License (LGPL) or other GPL-compatible licenses. 
Operating modes.
QEMU has multiple operating modes:
- User-mode emulation: In this mode QEMU runs single Linux or Darwin/