Remove DRM from expired PDF

[quachtinh]

Hi everyone,

I succeeded removing DRM from most PDF files, but failed with expired PDF files, the error is "Error: Cannot find decryption key".


Open PDF with Acrobat Reader:


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Any idea?

Thank you.

[any ANONYMOUS forum user]

I don't think it is possible to remove DRM from expired ebooks. Besides DRM removal tools are intended to be used with legally purchased not rented ebooks.