[mman]

I am also new to the forum and looking for help.

I'm trying to remove the DRM from a PDF, but when I use ineptpdf I receive Error: error decrypting book session key.

From what I read on different sites, the error is caused by my version of ineptkey creating an adeptkey.der that is ineffective on my PDF.
Is this true?

If so, I have tried both versions 4.3 and 5 of ineptkey, but received the same error with both of them. Would anybody be able to help me?