[JSWolf]

One recent eBook I had to clean of all of the fonts is The Martian. It has FreeMono, FreeSans, and FreeSerif embedded. These fonts are just way too light for use on an eInk Reader. I think whoever decided to embed those rather poor fonts has neve viewed that eBook on any eInk Reader or they would not have been used. Even with the front light on, it's still hard to read. The sans font was not too too bad as it was just for chapter titles and readable (not as good as it should be). The serif font was hard to see and the mono font nearly impossible to see.