Need to decrypt PDF password from Engineering Standard Опции

[ioncube]

I have a thermal engineering book (multiple pdfs) which is SECURED & protected by password. I cannot combine multiple pdfs into single book becaus eof this. Any help would be greatly appreciated.

I have tried using PDF Password Remover 3.1 (it usually works)

https://www.mediafire.com/file/0iex0ggmelddpfn/Wolverine-Engineering-Data-Book.7z/file