Samsung Knox is Samsung's mobile-security platform spanning hardware (TrustZone, Secure Element) and software (Knox container, Knox Manage MDM, Knox Configure). For wholesale buyers, the most operationally relevant aspect is the Knox fuse (Knox Warranty Bit), a hardware fuse that blows permanently if the bootloader is unlocked, the device is flashed with a non-Samsung firmware, or root is attempted.
A blown Knox fuse means: warranty is void, Samsung Pay no longer works, Samsung Health secure features lose integrity, enterprise enrollment is rejected, and the device is materially less valuable in resale. The fuse status is visible in Settings > About phone > Software information > Knox Warranty Bit; a value of 1 means tripped.
Wholesale check: verify Knox status on a sample of any Samsung lot. Devices with tripped Knox should price 15-30 percent below clean equivalents because they cannot be sold into enterprise channels and have reduced consumer appeal. Refurb operations targeting enterprise resale should refuse Knox-tripped stock entirely.