Comment by WillAdams
19 hours ago
Ages ago, I consulted on a case where a converted font was included in a product --- it was even simpler than https://luc.devroye.org/kinch.html since no transformations were applied --- just had to figure out which version of which font editor was used to open up the font file and then which settings were used to re-generate the font in the new format used for the infringing product.
I'm not saying it's never possible in any case, just that in cases where it's not you can't prove infringement.
If a digital font file is used as a source, it's probably too much work for the thief to erase all traces of that --- whether or no it should be acceptable to re-create a typeface design w/o crediting the original designer and adhering to their intent in terms of licensing and distribution is a different discussion.