How to remove protection from a PDF file (protection of Tomsk Polytechnic University)?

Question

Burglary protection

The essence of the matter is this: There is a PDF file of the format (such as a manual, almost like a book), it has password protection. I need 30 pages to go through the text (I don’t take a sin on my soul, this text will not be used in commerce! I’m sincerely against it), this is for the lab, if you’re interested, then the topic is: “Characteristics of digital data processors”, and so there is protection on it , I tried to shoot through the online version, the result is copying the text, and an incomprehensible encoding comes out, which I can’t change to normal. How can the issue be resolved?
Encryption level 128bit RC4

Answer 1

Already 30 pages could have been reprinted, it will come out faster