After continued pressure from the two groups and Knowledge Ecology International (KEI), an intellectual-property research organization, the USTR promised in March to review the transparency of its trade negotiations. Obama and U.S. Attorney General Eric Holder also reiterated Obama's promises for a more transparent government.

USTR released a six-page summary of ACTA in early April and 36 additional pages later in the month.

EFF and Public Knowledge continue to have major concerns about the pact, the groups said. Large intellectual-property companies have publicly requested that ISPs be required to filter their customers' Web communications for copyright-infringing material, they noted. The Recording Industry Association of America also wants ISPs to kick off customers after repeat allegations of copyright infringement.

"What we've seen tends to confirm that the substance of ACTA remains a grave concern," Public Knowledge staff attorney Sherwin Siy said in a statement. "The agreement increasingly looks like an attempt by Hollywood and the content industries to perform an end-run around national legislatures and public international forums to advance an aggressive, radical change in the way that copyright and trademark laws are enforced."

USTR continues to examine its transparency, said Stanford McCoy, assistant U.S. trade representative for intellectual property and innovation. "The transparency issue is one we take seriously at USTR," McCoy said Wednesday while speaking at a Computer & Communications Industry Association event in Washington, D.C.