>>>>> On Mon, 21 Oct 2019, Joshua Kinard wrote:

>   - altfont is licensed under "GNU General Public License" (version ??)
>   - achemso is licensed under "The LaTeX Project Public License 1.3c"
>   - arraysort is licensed under "The LaTeX Project Public License 1.2"
>   - amsfonts is licensed under "The SIL Open Font License"
>   - a0poster is licensed under "The LaTeX Project Public License" (ver ??)
>   - arydshln is licensed under "The LaTeX Project Public License 1"
>   - aurl is licensed under "Public Domain Software"

> That's just a random selection from the 'a' category. Do we have
> copies of those licenses in the tree?

Yes.

> Do they allow redistribution of the distfiles?

Yes.

> For the users that want "free" software, do any of the licenses in any
> of the TeX modules put up any disagreeable restrictions?

All of TeXLive should be free software. Upstream doesn't accept anything
that is non-free. (Mistakes can happen, though. There was one non-free
module in texlive-latexextra-2019, which was sorted out in bug 687328.)

Ulrich