[Koha] Secure 856u

[Jonson philip]

hi
i uploaded some fulltext PDF on koha and insert url in 856u to access , when
i click 856u  downloaded fulltext without user account, i changed
authnotrequired => 1 to => 0 in perl but opac-detail in all records required
ID and password , any way to secure only filed 856u or secure the records
has contains 856u to access from my patrons only. thank's
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