Lately in advertisements there have been a lot of circular QR codes[1]. Which often apparently present data outside of the alignment patterns. Is that merely an artistic device, or is there some standard permitting information extending beyond the square region?
Some of them however are implemented to be read by a specific non-standard reader, something such as the snap chat codes.
[0]: https://stackoverflow.com/questions/66837985/damaging-qr-cod...