GREEN BAY, Wis. -- As the only NFL team required to disclose its financial information to the public, the Green Bay Packers have become Exhibit A amid rising tensions between owners and players over a new collective bargaining agreement.

Just don't expect other teams to open up their books in an attempt to make the owners' case.

Visiting the Packers' annual shareholders meeting on Thursday, NFL commissioner Roger Goodell told reporters that the players union already has enough financial information to understand why owners think the current system doesn't work.

Speaking to shareholders at Lambeau Field, Packers president and CEO Mark Murphy reiterated that while the team remains profitable, its player costs have been rising twice as fast as revenue gains over the past four years.

"Well, the trend is not positive, and it has been that way for four years now. And I do think with the preservation fund and some of the resources that we have set aside, we are sound financially but we need to see changes in the system," said Murphy.

The Packers have their first training camp practice Saturday.