> When containing images and image sequences encoded in a particular format (e.g. HEVC or AVC) its use becomes subject to the licensing of patents on the coding format.
I'm not sure what you're trying to say with that quote? As I mentioned, HEVC is subject to licensing costs. If you try to wrap your HEVC video content in an HEIC container, you don't suddenly get to skip paying the original licensing costs.
He's trying to remark the fact that HEIC = HEIF(HEVC) => non-free. See my other reply to your first comment. Note that HEVC doesn't necessarily mean video. It can be used to compress still images, as it's the case of Apple devices.
HEIC (image encoding) is available without royalties: https://en.wikipedia.org/wiki/High_Efficiency_Image_File_For...
Regardless, in this case, as others noted, iOS would have just converted to jpg if College Board was using a standard image upload form.