I am guessing this is a long shot, but here goes.
We email a PDF to a client, they print it out, sign it and perhaps annotate it, scan it back in and then email it back to us. So the PDF that comes back is not nicely formatted, but rather a picture saved as a PDF. I need to compare the two PDFs and find the annotations.
Are there any libraries preferably in C# (paid and free) that would be helpful in this?