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Copyright law is complicated to begin with.

But many American companies have run into extra trouble trying to do business in China, where trademark laws are completely different than they are here in the United States.

Take a chain of shoe and athletic wear stores in China, where things might look a little familiar. Looming above the columns of shoes and rows of clothes is the store’s logo: a silhouette of a basketball player, mid-air, his outstretched arm holding a basketball.

The name of the chain is Qiaodan (pronounced cheow-dahn). It’s the Chinese transliteration of Jordan — as in Michael Jordan, the six-time NBA champ who has a famous line of shoes called Air Jordans.

But the Chinese company Qiaodan Sports has no relation whatsoever to Nike’s Air Jordan brand. They are totally separate.

One store employee says people who come in usually know the difference, and if they don’t, they just have to ask and the staff will explain.

But many people don’t think to ask — because they assume the companies are connected.

Outside of a store in Shanghai, two customers told NPR that they didn’t know about the difference until the lawsuit hit the news.

“We used to buy Qiaodan because we thought it had something to do with Michael Jordan,” Alex Kong says. Now, he buys them a little less often.

Another customer asked the big questions when we spoke with her: “Why do they use the same name? Are they allowed to use it?”

As for why they use the same name, we can’t speculate. But they are indeed allowed to use it. Here’s how.

When Nike expanded the Air Jordan brand to China back in the 1990s, they only registered the English version of “Jordan.”

A few years later, a family-owned shoe company from Fujian province came along and registered “Qiaodan,” the Chinese version. Since then, Qiaodan Sports has registered dozens of other trademarks that seem related to Michael Jordan, including their own silhouette logo and the names of Jordan’s two sons in both Chinese and English.

Qiaodan Sports has since expanded to about 6,000 locations across China. They do hundreds of millions of dollars in in business each year.

Jordan sued the company in 2012. In a video explaining his take on the case, he emphasizes how much his name means to him.

“It’s something that I own. When someone takes advantage and misrepresents that, I think it’s left up to me to protect that,” he says. “I have no other choice but to turn to the courts.”

Qiaodan counter-sued in 2013, saying Jordan’s original suit had prevented them from going public.

The first rulings came down in April. The Beijing High People’s Court found Jordan’s claims against Qiaodan to be insufficient. Jordan asked for a retrial; earlier this summer, he lost that too.

Attorney Dan Harris has dealt with this time and again. He says Michael Jordan ran into a problem that’s common among American companies.

“Most countries, including China, give trademarks to whomever files for it first,” he explains. “But [in] the United States, it’s whoever uses it first.”

His firm Harris Moure specializes in helping American companies wade the waters of Chinese law. His firm gets a call or two a month about this exact issue.

“They become very unhappy when we have to tell them that instead of hiring us to sue that company, they should hire us to negotiate with that company,” Harris says. “That is not what they want to hear.”

Many American companies have run into this problem, including Gucci, New Balance and Tesla. Apple had to pay $60 million to a Chinese screen maker called Proview for the trademark to the iPad. Some companies aren’t even planning to sell their product in China — but even manufacturing product there can result in issues if the company hasn’t secured the trademark.

Since 2001, China has had a law that protects international trademarks that are very well-known in China. Starbucks won a case this way, against a Chinese coffee shop chain called Xingbake (xing means “star” in Chinese, and “bake” sounds similar to “bucks”). But victories for American companies are still rare.

Jordan’s camp say they plan to appeal to China’s Supreme Court. Harris thinks the superstar has a long row to hoe.

But maybe that persistence shouldn’t be a surprise coming from the guy who’s famous for saying, “I can accept failure … but I can’t accept not trying.”