I live in mixed world where companies are making proprietary software and paywalling everything. Yet, there's independent open source programs where I can get a copy, share, and expand as I want without worring about legal issues.
Free as in beer means I got a beer for free (gratis, "No Price"), whereas speech is I can say what I want (without being silenced).*
In this context, Okular is a free (As in price) and free (As in libre software). I can copy, share, modify, and share modification as I please. There is no subscription, paywall, or proprietary licsense that prohibits this.
= This may be inaccurate, wrong, misleading, and varying amoung countries and states.
I'm sticking to FreeCAD.