In August 2010, Brazil's attorney general issued a re-interpretation of a 1971 law, which had not been enforced, that would limit sales of farmland to foreigners to "50 modules", roughly equal to 5,000 ha. The decision called for strict enforcement of the law, saying foreigners could not own more than 25 percent of any municipality. No more than 10 percent of a municipality could be owned by foreigners of the same nationality, and the same rules should also be applied to Brazilian agricultural companies with more than 50 percent foreign capital. These proposals are still moving through congressional committees and not yet resolved. Meanwhile, the government has published a framework set of guidelines that require foreigners or foreign companies with authorisation to work in Brazil to provide documentation justifying the amount of land they want to purchase, to improve the national registries. Apart from these land ceilings, frontier areas – a strip of 50 km inside the national borders of Brazil – are "no go" zones, off limits to private investors wishing to acquire land, for national security purposes.