Infix is entirely built on Open Source components (packages). Most of them, as well as the build system with its helper scripts and tools, is from Buildroot, which is distributed under the terms of the GNU General Public License (GPL). See the file COPYING for details.
Some files in Buildroot contain a different license statement. Those files are licensed under the license contained in the file itself.
Buildroot and Infix also bundle patch files, which are applied to the sources of the various packages. Those patches are not covered by the license of Buildroot or Infix. Instead, they are covered by the license of the software to which the patches are applied. When said software is available under multiple licenses, the patches are only provided under the publicly accessible licenses.
Infix releases include the license information covering all Open Source
packages. This is extracted automatically at build time using the tool
make legal-info. Any proprietary software built on top of Infix, or
Buildroot, would need separate auditing to ensure it does not link with
any GPL1 licensed library.
Footnotes
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Infix image builds use GNU libc (GLIBC) which is covered by the LGPL. The LGPL does allow proprietary software, as long as said software is linking dynamically, not statically, to GLIBC. ↩