Comment by bayindirh
Nominally, yes. These are checked before your movie is being distributed, and you'll most probably face legal consequences if you don't pay for your licenses.
Not getting caught for some time doesn't count either. You'll pay retroactively, with some interest, probably.
Licensing page is at [0]. Considering the previous shenanigans they pulled against open video and audio formats in the past [1], these guys are not sleeping around. These guys call people for patent pools in a format, and license these pools as format licenses.
[0]: https://www.via-la.com/licensing-2/avc-h-264/avc-h-264-licen...
If you bought a legit licensed product the doctrine of first sale means their patent rights are exhausted.[0] They can't come after you for patent infringement. Those licenses are for manufacturers making new licensed products, not users of licensed products they purchased.
Can you show a single court case or even a press release where someone using a legit licensed product bought on the open market was sued for codec patent infringement?
[0] https://en.wikipedia.org/wiki/Exhaustion_doctrine_under_U.S....