How to Check and Make Sure PDFs Have Different Fingerprints
For each PDF you want to check:
1. Open the PDF in Chrome
2. Activate the Hypothesis extension
3. Click the “<” tab to open the sidebar. Then click on “?” and then “About this version”
4. The PDF Fingerprint is towards the bottom, marked “Fingerprint”.
The PDF fingerprint is a long string of numbers and letters in the Console, it should be different for each version of the PDF you’ve made.