By Hannah Karp And Alexandra Berzon 

Sony Corp. has been exploring the sale of its Sony/ATV Music Publishing unit, the company's recently leaked internal emails suggest.

The music publisher, co-owned by Sony and the estate of the late pop star Michael Jackson, is the world's biggest and is highly profitable, according to people familiar with the matter. Estimated to be worth between $1.5 billion and $2 billion, it owns the copyrights to most of the Beatles' songs, among thousands of others.

It was unclear from documents reviewed by The Wall Street Journal whether Sony is considering selling just its stake in the venture, or whether the whole unit might be put up for sale. Also unclear was the price Sony expects the publishing business to fetch, or when the company might try to sell it.

Spokesmen for Sony and Sony/ATV declined to comment.

For Sony, the potential sale would represent an easy and logical way to raise cash to prop up its long-struggling electronics division, according to a person familiar with the company's thinking. Sony posted a $1.2 billion net loss for the quarter ended Sept. 30.

The possible sale of Sony/ATV was mentioned in emails last month between top Sony executives. The emails were among the thousands of documents leaked several weeks ago by hackers trying to stop the release of the Sony Pictures film "The Interview," a lowbrow comedy about a plot to assassinate North Korean leader Kim Jong Un. U.S. officials have blamed the cyberattack on North Korea, and President Barack Obama last week promised a "proportional response." North Korea temporarily lost Internet connectivity Monday, though the U.S. hasn't taken responsibility for the outage.

Following Sony's annual "mid-range plan" meeting last month, the Tokyo-based secretary for Sony Vice President Kazuhiko Takeda sent an email to Sony Entertainment Chief Executive Michael Lynton, requesting a response to a number of "follow-up" items discussed at the meeting. A list of the discussion items appeared to have been attached to the email. Six other executives, including Sony Corp. of America Chief Financial Officer Steve Kober, were copied.

Later that day, Mr. Kober sent a private email to Mr. Lynton, offering to take the lead on responding to Mr. Takeda but asking Mr. Lynton not to forward the first email to "anyone in your organization," because the attached list of discussion items included "a follow-up point talking about the sale of Sony/ATV."

"As you are aware, we are trying to keep this top secret and manage this among a very small group," Mr. Kober wrote in his email.

Sony Corp. of America President Nicole Seligman also emailed Mr. Lynton that day warning him not to forward the note from Mr. Takeda's secretary.

The email "mentions the ATV issue," Ms. Seligman wrote. "We have asked that it be deleted going forward."

Mr. Jackson, the late pop star, bought ATV Music Publishing for $47.5 million in 1985, and sold Sony a 50% stake in the business for $90 million 10 years later, creating the joint-venture. He died in 2009 while preparing for a comeback tour.

In 2012, Sony and Mr. Jackson's estate joined with other investors, including Abu-Dhabi's Mubadala Development Company PJSC and music mogul David Geffen, to acquire EMI Music Publishing for $2.2 billion. Sony/ATV Music now administers the EMI catalog on the investor group's behalf.

It was unclear from the leaked Sony emails whether EMI would be packaged with Sony/ATV in a sale.

Activist investor Daniel Loeb had been urging Sony for more than a year to sell some of its entertainment assets to focus on its electronics business. But Mr. Loeb no longer has sway: his hedge fund, Third Point, sold its 7% stake in the company in October.

Write to Hannah Karp at hannah.karp@wsj.com and Alexandra Berzon at alexandra.berzon@wsj.com

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