I would like to correct a little:
Free/libre software isn't not-copyrighted, in fact, the licenses depend on copyright to exist. So, all rights are reserved, regardless.
However, it has a difference: It's not under the *default* copyright license.
Also, I don't know which was this speech you talk about (no references so far), but I can point out from [[https://www.gnu.org/philosophy/google-engineering-talk.html#freedom-2-moral-...]] that, according to Stallman, non-functiona/practical data/works must *at least* have the freedom to shared exact copies of the original work (half of freedom 2). This means that they must *at least* be under a license similar to CC BY-NC-ND.
Please note that, if we would talk about the inclusion of such works in free/libre system distributions, the requiremente would go further, in the sense that the freedom 2 *completely* would be required for such works, according to the GNU Free System Distribution Guidelines ([[https://www.gnu.org/distros/free-system-distribution-guidelines.html#non-fun...]]). This would require *at least* CC BY-ND.
Morever, it must be noted that functional/practical data/works (which must have all four freedoms) sometimes disguise themselves as non-functional/practical. For examples, see:
- Non-free :: Frogatto "data", whose scenarios have some logic/scripting elements inside.
- Free :: Battle for Wesnoth campaigns, id. Frogatto "data".