Revisions that Sen. Joe Lieberman (I-Conn.) made to his Cybersecurity Act seem to have appeased privacy advocates who lobbied against an earlier version of the bill.

Michelle Richardson, a legislative counsel for the American Civil Liberties Union (ACLU), told The Hill that Lieberman and other co-sponsors made "substantial changes" and undertook a "Herculean effort to build privacy protections" into the bill.

Sharon Bradford Franklin, senior policy counsel at The Constitution Project, applauded the changes, saying they "go a long way toward alleviating our concerns."

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"The amendments address key civil liberties concerns that have dogged the cybersecurity debate," agreed Leslie Harris, president and CEO of the Center for Democracy and Technology.

The statements mark a major shift for the privacy groups, which had urged the Senate to reject the previous version of Lieberman's bill to prevent an erosion of civil liberties.

Supporters of Lieberman's bill, including Sens. Susan Collins Susan Margaret CollinsTrump's Teflon problem: Nothing sticks, including the 'wins' Durbin: Democrats can 'slow' Supreme Court confirmation 'perhaps a matter of hours, maybe days at most' Senate GOP set to vote on Trump's Supreme Court pick before election MORE (R-Maine), Dianne Feinstein Dianne Emiel FeinsteinThe Hill's Morning Report - Sponsored by JobsOhio - Trump's tax return bombshell Hawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election MORE (D-Calif.) and Jay Rockefeller John (Jay) Davison RockefellerBottom Line World Health Day: It's time to fight preventable disease Lobbying World MORE (D-W.Va.), conducted months of negotiations behind closed doors with the privacy groups to develop the revised proposal.

Sens. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.), Dick Durbin Richard (Dick) Joseph DurbinHarris says she hasn't 'made a plan one way or another' on meeting Supreme Court nominee Trump, GOP aim to complete reshaping of federal judiciary The Hill's Morning Report - Sponsored by JobsOhio - Trump's tax return bombshell MORE (D-Ill.) and Ron Wyden Ronald (Ron) Lee WydenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Ore.) also pushed for tougher privacy protections.

Like the controversial Cyber Intelligence Sharing and Protection Act (CISPA) that passed the House in April, Lieberman's Cybersecurity Act would encourage companies to share information about cyber threats with the government.

The privacy groups fought fiercely against CISPA, saying it would lead private companies to hand over their customers' personal information to military spy agencies.

President Obama also threatened to veto CISPA over privacy and civil liberty concerns.

The revised Lieberman bill narrows the definition of what can be shared and requires that any information shared with the government must go to civilian, not military, agencies. The privacy groups argue that the legislation should not empower the CIA and the National Security Agency (NSA) to collect Americans' personal computer information.

The bill also dictates that the information can only be used for addressing cybersecurity threats and not other purposes, such as national security or criminal investigations.

"We have worked very closely with Senate colleagues, privacy groups and industry to strengthen the bill's privacy protections without undermining the fundamental goal of improving information cybersecurity sharing," Feinstein said in a statement. "I believe the bill is stronger as a result of these changes."

But the privacy groups stopped short of a full-throated endorsement of the bill. The ACLU's Richardson said "not all of the problems with the Cybersecurity Act are solved yet," and Gregory Nojeim, a director for the Center for Democracy and Technology, said "more work needs to be done on the Senate floor to secure CDT’s support for this legislation."

The groups' statement, however, focused on urging lawmakers not to water down the protections that are already in place.

But appeasing the privacy groups may have moved the bill's supporters farther away from winning over business groups.

One industry official argued that companies should not be restricted from sharing information with military agencies.

"Sometimes it is appropriate for us to talk directly with [the Defense Department] or NSA," the official said.