Those rules, based on national security considerations, sharply curtail the potency of American-made encryption technology.

Since the 1970s, three rules have curtailed the number and scope of fights in the NHL.

But the rules do not curtail analysts from working for clients of a firm's investment banking arm.

If passed, the rules would significantly curtail the number of health claims made on labels beginning in 2005.

The new rules on deductions initially curtailed the growth of I.R.A.'s, with fewer than 700,000 mutual fund accounts added in 1988.

The new rules restricting hand-checking have curtailed his defensive aggressiveness.

Those groups, called 527 committees, can spend unlimited contributions on advertising and turning out voters, though proposed rules could curtail their powers.

But Mr. Deen argued that the new rules would curtail some smuggling by focusing on the point where the stones are exported.

But they caution that overly stringent rules would hamper legitimate lenders and curtail access to loans for people who need them.

The rules would curtail a longstanding practice that permits developers to build higher buildings in exchange for creating plazas or other public amenities at ground level.