[pierre]

This is a nice UI for end users, however it seems to be a seems wrapper on top of mutool, which is distributed as AGPL. If you want to process PDF locally, legally and safely you should use their CLI instead.

[cess11]

How did you figure that out? Couldn't it be Poppler as well?

[pierre]

I read the output header, and see the Artifex (mutools / gs team) headers