You can provide write ups and walkthroughs on retired machines only; several people have done this (with ippsec doing the official video; available on the machines profile page). i.e. there is only a prohibition on active machines and challenges.
You can provide write ups and walkthroughs on retired machines only; several people have done this (with ippsec doing the official video; available on the machines profile page). i.e. there is only a prohibition on active machines and challenges.