176 apparel licenses have been revoked by The University of Iowa because the companies concerned have either failed to sign the school's code of conduct or disclose the location of their factories.

The licenses are believed to have generated a total of $34,805 in royalties for the University last year. 

The college adopted the code following protests last spring by members of the group Students Against Sweatshops. It outlines standards for wages, overtime, benefits and discrimination policies.

According to the Tribune news service, six other companies, including Nike, Russell Athletics, VF Knitwear and Josten's, have disclosed the information, but said they still have reservations about signing the code.