I experimented with building an automated setup for this for race charts. Since equibase has historical charts one could build extensive pp collection.
Ocr: Google docs uses Ocr to do pdf conversion and it handles charts fine. However the formatting is atrocious and would be difficult to deal with.
Cracking: breaking the password to allow text access proved much more fruitful. After unlocking one can use a pdf parse package like many languages have (i used pdfminer for python) and one can pretty reasonably get what they need.
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