Campaign finance ruling

• A 63-year-old prohibition on corporations and unions using money from their general treasuries to produce and run their own campaign ads for or against a particular candidate.

• A prohibition contained in the McCain-Feingold law that bars issue-oriented ads paid for by corporations or unions 30 days before a primary and 60 days before a general election.

• A century-old ban on donations by corporations from their treasuries directly to candidates.

• The requirement that any corporation spending more than $10,000 in a year to produce or air a campaign ad covered by federal restrictions must file a report with the Federal Election Commission, revealing the names and addresses of anyone who contributed $1,000 or more to the ad's preparation or distribution.

• The requirement that an ad include a disclaimer stating who is responsible for it, if the ad is not authorized by a candidate or political committee.