McDonald's, which is a big fast-foood company that sells burgers and fries, wanted to have the right to use a special name for their chicken burger in Europe. But they lost that right because another smaller food company called Supermac's said McDonald's did not really use that name enough in Europe. This means McDonald's cannot stop other people from using the same name for their chicken burgers in some countries, but it can still keep its regular burger with beef called Big Mac. Read from source...

1. The title is misleading and sensationalized: "McDonald's Loses Chicken Big Mac Trademark In European Union". This implies that McDonald's has completely lost the trademark, which is not true. They only lost it for the chicken version of the sandwich, not the beef one. A more accurate title would be: "McDonald's Loses Chicken Big Mac Trademark In European Union, But Retains Beef One".