olemus
teabe (näiliselt salajase) kogumine ja tuletamine avalikest allikatest, sealhulgas ajalehtedest
= gathering and analyzing publicly available data for intelligence purposes

ülevaateid
https://www.nixu.com/blog/open-source-intelligence-its-incredible-what-you-can-find-public-sources

https://www.recordedfuture.com/open-source-intelligence-definition/

https://owasp.org/www-pdf-archive/OWASP-070317.pdf

https://en.wikipedia.org/wiki/Open-source_intelligence

https://www.palgrave.com/gp/book/9781137353313

https://apps.dtic.mil/sti/pdfs/AD1053555.pdf

https://i-intelligence.eu/uploads/public-documents/OSINT_Handbook_2020.pdf