By Tom Fairless 

BRUSSELS--As Google Inc. prepares to fight charges that it has violated Europe's competition rules, lawyers here are already limbering up for the next battle: big data.

At issue: whether the way that major technology companies such as Google and Facebook Inc. mine people's personal data should worry antitrust officials.

Personal data is an increasingly important asset for digital businesses, some experts argue, even though people hand it over voluntarily when they use free online services.

Major Internet firms compile huge data sets that could, these experts say, give them an unfair edge because they effectively act as a barrier to new competition. Incumbent firms might have developed such sophisticated profiles of consumers, and can target advertising with such precision, that new rivals cannot hope to catch up.

"I think big data is the next big topic" in the European Union for U.S. technology companies, said Alec Burnside, an antitrust lawyer with Cadwalader, Wickersham & Taft LLP who represents a number of complainants in the EU's antitrust case against Google.

Lawyers who represent major U.S. tech companies in the EU express similar sentiments. But they argue that the concerns are misplaced: Data isn't exclusive, they say, because many companies can hold the same information on people's names, addresses and credit-card details, for instance. Numerous online platforms also compete for users' attention, and switching platforms is easy.

"Big data are ubiquitous, widely available and of fleeting value," said Maurits Dolmans, an antitrust lawyer with Cleary Gottlieb Steen & Hamilton LLP in Brussels, whose firm represents Google in antitrust matters.

Data are also subject to diminishing returns, Mr. Dolmans said: Search engines such as Bing and DuckDuckGo "are well beyond the size where scale-effects matter."

Either way, the question is being raised on both sides of the Atlantic. But it has particular resonance in Europe in the wake of Edward Snowden's revelations that the U.S. National Security Agency carried out widespread monitoring of European citizens.

Those revelations have prompted a surge in scrutiny of U.S. tech companies in the EU, in particular around how they process personal data, but extending to issues such as unfair competition and tax. The heightened suspicions also appear to have compounded Google's antitrust woes in the EU.

In a preliminary conclusion on the issue last year, the EU's top data-protection official, Peter Hustinx, wrote that "in the digital economy personal information represents a significant intangible asset."

"This has potentially far-reaching implications for the interpretation of key concepts including transparency, market dominance, and consumer welfare and harm," Mr. Hustinx wrote.

Questions around big data could be a particular concern for Google, its critics argue, because its services span markets that range from shopping to travel to email and music. That arguably gives the company a profile of consumers so sophisticated that no competitor could hope to match it.

Not only do large data sets potentially act as a barrier to entry to would-be competitors, they are also valuable assets that could be relevant in analyzing mergers, Mr. Burnside said. For instance, a dominant firm could decide to reduce the level of protection of confidential data after a merger without fear of losing business. If consumers are seen to be damaged by this, it could provide a reason to block a deal.

So far, the EU's competition regulator has shied away from vetoing mergers over concerns around data, and argued that privacy issues should be governed by data-protection rules rather than competition law.

During the EU's review of Facebook's $22 billion acquisition of messaging service WhatsApp last year, Europe's telecommunications operators had lobbied against the deal, warning it could give the merging companies excessive market power and control over users' data.

Facebook didn't respond to requests for comment.

As part of its findings, the EU provided estimates that Google controlled about 33% of data collection across the Web, more than any other company, with Facebook coming in at 6.4%.

But in its decision, the EU said Facebook's WhatsApp purchase didn't pose a concern because "there will continue to be a large amount of Internet user data that are valuable for advertising purposes and that are not within Facebook's exclusive control."

It also ruled that "any privacy-related concerns flowing from the increased concentration of data within the control of Facebook as a result of the transaction do not fall within the scope of EU competition law."

That may yet change. While the EU's former antitrust chief, JoaquĆ­n Almunia, was skeptical of approaching privacy-related concerns, his successor Margrethe Vestager has expressed an interest in the big-data debate since her five-year mandate began in November.

Big data "works very much as a currency on the Net right now," Ms. Vestager told The Wall Street Journal in an interview in February. "I'm not sure people realize that they do pay because these pieces of information about yourself, well, they are worth money in the Old World."

She said that the area was "still developing very rapidly," and that technology companies had very different business models. "Google, Facebook, SAP, they're very different," she said. "I think we have to do a very thorough... analysis... in order to fully understand what are the possible consequences of big data."

Sam Schechner contributed to this article.

Write to Tom Fairless at tom.fairless@wsj.com

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