U.S. Senate Majority Leader Harry Reid will postpone a test vote next week on a bill to fight online piracy and counterfeiting, after a storm of protest from Internet companies and search engines who fear overregulation and censorship.

The protests included a blackout by Wikipedia this week and a petition by Google that generated more than seven million signatures.

Now at least a half-dozen senators who sponsored the measure say they oppose it.

Reid says he's optimistic about reaching a compromise that protects Americans' intellectual property and maintains openness and innovation on the Internet.