How to license the operating systems, software and libraries used?

Question

Copyright

In anticipation of the post , the following question arose:
If I want to use, for example, a set of the following software: FreeBSD, VirtualBox, FreeCAD, KiCAD, wxWidgets, GTK +, OpenCV, CUDA SDK, VC Compiler, TDM-GCC, PostgreSQL, etc. ., etc.
What operations, from a legal point of view, do I need to perform so that I do not prove that this is all free, and under the public license of companies (communities) of developers, these applications, I can use these applications, libraries and source codes?
Thank you.

Answer 1

Previously, and so it was not required to prove anything, and after the adoption of these amendments, it will no longer be necessary.