I have a clean original pdf file called "clean_v1.pdf". I made a copy of the file and named it "annotated.pdf". I opened and annotated "annotated.pdf". Amazingly, when I opened "clean_v1.pdf", I found the original clean file is no longer clean -- I saw the clean file was also annotated! This is scary!
I then did another experiment. I edited "clean_v1.pdf" and saved the new version as "clean_v2.pdf". The change was substantial so "clean1_v1.pdf" and "clean_v2.pdf" were two very different files. Again, amazingly, when I opened "clean_v2.pdf", all the annotations originally made on "annotated.pdf" showed up!
What happened? Is this a bug? Please help!
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