That effectively blocks companies from offering personalized experiences or suggestions based on gathered information to anyone.

He can also block such companies from selling to the United States government or obtaining more than $10 million a year in American bank loans.

These blacklists, however, often also block legitimate companies and individuals from sending e-mail.

Instead, it may herald a contentious era as governments try to block companies from doing what they think best - and in the process discourage investment.

They denied creating a spot shortage on the market, or trying to block other companies from landing sites.

It would also block companies and individuals already doing government business from making any contributions at all.

The sanctions have the effect of once again blocking American companies from launching satellites on Chinese rockets.

Norway has a history of state campaigns to block foreign companies from taking over major Norwegian firms.

Under French law, the Government can block foreign companies from acquiring control of a French concern.