Howard Michael Phillips, 64, was charged on Thursday with an offence contrary to section 3 of the National Security Act (NSA), the Metropolitan police said.
Phillips, of Harlow, in Essex, has been remanded in police custody and is expected to appear at Westminster magistrates court on Thursday afternoon.
As part of the investigation, officers searched addresses in Hertfordshire and Essex; both searches are now complete.
The arrest is not linked to any other recent NSA related charges or investigations, and there is no perceived threat to the public.
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