Do you have a link? Could only find a 2010 article[1] that appears to have been debunked by MPEG-LA themselves (per the updates in the blog post).
[1] https://www.osnews.com/story/23236/why-our-civilizations-vid...
From Nikon D500 User Manual [0], page 22:
From Nikon Z6/Z7 User Manual [1], page 236:
Sony has a similar note for A9 [3], but can be grouped under here, which is almost the same:
AVC Patent Portfolio License: THIS PRODUCT IS LICENSED UNDER THE AVC PATENT PORTFOLIO LICENSE FOR THE PERSONAL AND NON - COMMERCIAL USE OF A CONSUMER TO (i) ENCODE VIDEO IN COMPLIANCE WITH THE AVC STANDARD (“AVC VIDEO”) AND/ OR (ii) DECODE AVC VIDEO THAT WAS ENCODED BY A CONSUMER ENGAGED IN A PERSONAL AND NON - COMMERCIAL ACTIVITY AND / OR WAS OBTAINED FROM A VIDEO PROVIDER LICENSED TO PROVIDE AVC VIDEO. NO LICENSE IS GRANTED OR SHALL BE IMPLIED FOR ANY OTHER USE. ADDITIONAL INFORMATION MAY BE OBTAINED FROM MPEG LA, L.L.C. S EE http://www.mpegla.com
From Canon R5 User Manual [2], page 939:
“This product is licensed under AT&T patents for the MPEG-4 standard and may be used for encoding MPEG-4 compliant video and/or decoding MPEG-4 compliant video that was encoded only (1) for a personal and non-commercial purpose or (2) by a video provider licensed under the AT&T patents to provide MPEG-4 compliant video. No license is granted or implied for any other use for MPEG-4 standard.”
THIS PRODUCT IS LICENSED UNDER THE AVC PATENT PORTFOLIO LICENSE FOR THE PERSONAL USE OF A CONSUMER OR OTHER USES IN WHICH IT DOES NOT RECEIVE REMUNERATION TO (i) ENCODE VIDEO IN COMPLIANCE WITH THE AVC STANDARD (''AVC VIDEO'') AND/OR (ii) DECODE AVC VIDEO THAT WAS ENCODED BY A CONSUMER ENGAGED IN A PERSONAL ACTIVITY AND/OR WAS OBTAINED FROM A VIDEO PROVIDER LICENSED TO PROVIDE AVC VIDEO. NO LICENSE IS GRANTED OR SHALL BE IMPLIED FOR ANY OTHER USE. ADDITIONAL INFORMATION MAY BE OBTAINED FROM MPEG LA, L.L.C. SEE HTTP://WWW.MPEGLA.COM
[0]: https://download.nikonimglib.com/archive3/4qUKV00WD5Bh04RdeC...
[1]:https://download.nikonimglib.com/archive5/8Yygr00R9Ojb058Kwq...
[2]: https://cam.start.canon/en/C003/manual/c003.pdf
[3]: https://helpguide.sony.net/ilc/1830/v1/en/contents/TP0002351...
It seems the one caveat, per the Engadget article, is directly distributing AVC video to end users (I suppose like a direct download link on a personal site) is what requires a license but that license is free to obtain.
[1] https://www.engadget.com/2010-05-04-know-your-rights-h-264-p...
There are other license models, which is about manufacturers, publishers and TV stations, etc.
But nowhere it says "there's a free license for these cases, just get it from here".
This all looks like a rabbit hole for me.
Similar to software that is free or low cost for non-commercial use only, even with the same functionality.
The good news is typically nobody will chase you down on this unless you are making real money. The bad news is, once you are, they will.