Quote:
Originally Posted by charmian
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After Adobe introduce CS4, they forced everyone to move to CS4 from CS3 in 2009. If you have PDFs (no ePubs back then) encrypted using CS3, you had a window of just nine months (April toDecember 2009) to do the operations necessary to transfer them to CS4 encryption. If you missed that nine month window, your encrypted PDFs could no longer be accessed at all.
Yes, a very similar situation, except that there were far fewer encrypted PDFs around than there are now encrypted ePubs.