@Suiseiseki

> There is no COPYING file in a directory called "source"

There is no directory called "source"; there is a "src". The "source directory" would be the directory the source is in. There is a file called "COPYING" in that directory. I don't know how you missed it.

> Software under weak licenses are almost always sloppy legally, which means there is no certainty you are granted freedom,

Here is this again:

> The two major categories of free software license are copyleft and non-copyleft. Copyleft licenses such as the GNU GPL insist that modified versions of the program must be free software as well. Non-copyleft licenses do not insist on this. We recommend copyleft, because it protects freedom for all users, but non-copylefted software can still be free software, and useful to the free software community.

It is free software, it is available under a free license. Someone else may make a non-free version of it, which the license permits. I do not plan to do that with my bootloader.