—represents a "Custom ISO," a modified version of the Windows installer often found on peer-to-peer networks.
This suggests the installer is pre-configured to look for a BIOS-embedded digital license. In many custom builds, "OEM" also implies it includes "slic" drivers or activators that attempt to bypass genuine validation. JUNH (June): Windows 10 X64 21H1 Pro 3in1 OEM ESD pt-BR JUNH...
On a brand-new custom build, they select DLA to handle activation instantly without a physical key. —represents a "Custom ISO," a modified version of