olemus
kontekstist sõltuv loa andmise vahend
=
a content-dependent permit control device

(a) pääsu reguleerimise mehhanismides
näiteks
- SELinuxis
https://wiki.gentoo.org/wiki/SELinux/Tutorials/How_SELinux_controls_file_and_directory_accesses

- SPDL-keeles
http://seedit.sourceforge.net/doc_devel/simplified_policy_manual/node23.html

- Apache'is
http://www.askapache.com/htaccess/apache-authentication-in-htaccess/

(b) failis robots.txt

https://technicalseo.com/crawl-indexation/directives/robots-txt/