As suggested by @Abhishek Rao on Adobe community
I report here the problem and the new functionality...

PDF Password (BUG and New Feature)

When I export a document to PDF from Indesign (or illustrator), I would need to password protect the Copy/Modification of the elements in my PDF, at the same time allow READING and PRINTING of that PDF document.

All this is currently ALLOWED BY "INDESIGN"! in PDF export.
When I create a PDF with these limitations, I open it in ACROBAT and I can SEE and PRINT IT.
When I try to MODIFY IT, Acrobat asks me for a PASSWORD.
ALL RIGHT.

THE PROBLEM: Since most designers use PDFs to create not only digital products to download, view and print at home, but very often use PDFs to send their PDFs to external printing services (Digital printing or Typography).

The problem is that these Services often use INDESIGN/ILLUSTRATOR to layout and imposition documents (with a few pages), or more sophisticated Imposition Software.
This problem occurs when the PDF is imported into INDESIGN/ILLUSTRATOR for layout, the PDF is not imported if the password is not entered.
Given that the PDF has been inserted with the possibility of Viewing and Printing only, why is a simple import (from a linked PDF) not allowed???

The password function at this point becomes useless for this purpose. I would like to protect the documents from being able to prevent the printers from "reusing" my contents (it often happens, bypassing the author of the creative content), but at the same time allow them to Print my document, since that is their job.

How to solve it? Is it possible to change this procedure? Or put a password only for printing and importing ??

It seems stupid, but in practice believe me this is the real useful function for that password.

Then if in other ways, software or things of various kinds it would be possible to bypass the password by decrypting it, (I don't know how it's done, but they tell me it would be possible), well that's another matter that doesn't apply to this request, but it's certainly something not for the common user, but for programmers who are experts in decryption.