Unable to open extra media via playlist

main error: unsafe option "input-slave" has been ignored for security reasons

What difference does it make where the file is located in the playlist?

#EXTM3U
#EXTVLCOPT:input-slave=[media]
...

and

#EXTM3U
[media]

What can input-slave open that a normal input can't? If something is threatening in the playlist, wouldn't it be a threat in the main line for the normal input anyways?

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