By Takashi Mochizuki 

TOKYO--Sony Pictures Entertainment's three-week struggle with hackers upset about its North Korea movie "The Interview" has highlighted the unit's independence from its Tokyo parent, Sony Corp., which has mostly taken a hands-off approach to the problem.

A Sony spokeswoman in Tokyo said Thursday that the decision to pull the movie from U.S. screens was made by the Los Angeles studio, and Tokyo was informed afterward.

The Japanese electronics giant bought the film company, then known as Columbia Pictures Entertainment, in 1989 as a part of its strategy to strengthen its content offerings and seek synergies with the hardware business. Sony paid $4.9 billion, which made it the most expensive acquisition of a U.S. company by a Japanese firm at that time.

Amid frequent losses at other Sony businesses, the movie arm has been a stable source of revenue, generating $504 million in operating profit in the year ended March 2014. "The entertainment unit is an important pillar for us," Sony Chief Executive Kazuo Hirai said at a November meeting with investors.

Hollywood-based executives have largely run the unit with relatively little direction from Tokyo, according to people with experience in Sony's operations. A former Sony senior official said people at headquarters consider the U.S. subsidiary a completely different entity and are aware that the studio doesn't like to be ordered around by Tokyo.

In one instance, headquarters sent some people to the U.S. to work at Sony Pictures, he said, "but the studio returned them quickly, saying they don't fit its culture."

Unlike most Sony executives, Mr. Hirai started in the U.S., at the company's music unit. He has tried to bring every branch of the company together under his slogan of "One Sony" to make the most use of Sony's assets--including hardware, software and network services.

The 53-year-old CEO made a rare decision to intervene in the movie studio's daily operations earlier this year. Leaked emails show that on several occasions he expressed concerns about the movie's script, in which North Korean leader Kim Jong Un is assassinated.

In one cut, "there is no face melting, less fire in the hair, fewer embers on the face," motion picture chief Amy Pascal wrote to Mr. Hirai, regarding a scene in which Mr. Kim's helicopter is hit with a missile and his head explodes in flames. Mr. Hirai in turn asked Ms. Pascal try to get filmmakers to cut the scene further and remove it from the international version of the movie.

Despite those interactions, people familiar with the matter said there were only a few executives in Tokyo, including Mr. Hirai, who were frequently briefed on the issue. Most Tokyo employees weren't aware of the movie before it came under the media spotlight, they said.

Since the hacking first emerged publicly Nov. 24, the Tokyo parent company hasn't released any statements or made any public moves in response to the crisis.

"It's very reasonable that the issue is handled by the U.S. because that's where the incident is playing out, but Sony in Tokyo could have at least issued a statement or two--say, apologizing for concerns or worries that the issue might have caused," said Yu Okazaki, an analyst at Nomura Securities.

It's not the first hacking attack for Sony. Its videogame division suffered widespread cyberattacks in 2011. At that time, more than 77 million accounts were affected and Sony spent three months to fully restore the service. After that, the company created a team, led by its chief information security officer, to beef up defenses.

Online security professionals say the latest hacking case is different in nature from the 2011 case and Sony is less to blame given the sophistication of the attack.

People at Sony in Tokyo say the affair hasn't changed Mr. Hirai's confidence in the powerful duo running his Hollywood business--Ms. Pascal, who is co-chairman of Sony Pictures Entertainment, and Michael Lynton, chief executive officer.

While Sony's stock price has fallen somewhat in the past two weeks, it is still one of the top performers in the Tokyo stock market this year. The share price has risen more than 50% over the past six months as investors gained confidence that the company's electronics arm is recovering from years of weak results. On Thursday, Sony shares traded up more than 4%, outperforming the benchmark index.

Yasuo Nakane, an analyst for Deutsche Securities, said the incident shouldn't significantly affect the financial performance of Sony as a whole, although he said it was hard to calculate at this stage how much damage the studio would suffer.

Write to Takashi Mochizuki at takashi.mochizuki@wsj.com

Access Investor Kit for Sony Corp.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=JP3435000009

Access Investor Kit for Sony Corp.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US8356993076

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Sony (NYSE:SONY)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Sony Charts.
Sony (NYSE:SONY)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Sony Charts.