I want to expand some information:
1. This is NOT AND OLD ENCRYPTED PDF, so this is not the case of:
Quote:
I have an old encrypted PDF file that won’t open in Adobe Digital Editions, how can I remove the DRM?
If your PDF ebooks cannot be read in Adobe Digital Editions, the tools here cannot help. They are probably encrypted using the Content Server 3 (or earlier) methods which Adobe no longer support, not even to allow conversion to Content Server 4 (AKA Adobe Digital Editions).
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2. But we know that unless a PDF is licensed with a key, we cannot open/decrypt it.
The file in above link is not licensed with a key.
So without a key, how can we remove the lock?
I will be very grateful if the most experienced members give opinions
Thanks a lot in advance