Analysis of information sources in references of the Wikipedia article "Trojan horse (computing)" in English language version.
Unlike a virus or worm, Trojans cannot spread themselves.
Also, one may not change the owner of a file with the set—user—ID bit on, otherwise one could create Trojan Horses able to misuse other's files.
...some sort of protection from user written applications programs that may contain "Trojan Horses" [sic]
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: CS1 maint: url-status (link)...some sort of protection from user written applications programs that may contain "Trojan Horses" [sic]