URL domain masking

i have users that sre able to see some pages.
i don´t want them copying and pasting the url
to enter in these pages further

to see thesepages they need to insert some passwords and especifc log in
login without an email

the univercity send them the password and they use the password to acess these especific pages

with the wix pasword pages it can be done becaus these pages are dynamic and with wix i can´t define one password for one especific dynamic page.

so i need to make a custom password process to the user