Wikipedia:
"In 2000, the World Wide Fund for Nature sued the World Wrestling Federation (now named World Wrestling Entertainment) for unfair trade practices. Both parties had shared the initials "WWF" since March 1979. The conservation organization claimed that the wrestling company had violated a 1994 agreement regarding international use of the WWF initials.[7][8]
On August 10, 2001, a British court ruled in favour of the Wildlife Fund. The World Wrestling Federation filed an appeal in October 2001. However, on 5 May 2002, the World Wrestling Federation changed its Web address from wwf.com to wwe.com, and used an automatic editing override to replace every "WWF" reference on the existing site with "WWE", as a prelude to changing the company's name to "World Wrestling Entertainment" and its stock ticker from WWF to WWE.
Abandonment of the acronym did not end the two organizations' legal conflict. Later in 2002, the Wildlife Fund petitioned the court for $360 million in damages, eventually leading to an out-of-court settlement for an undisclosed amount. In 2003, World Wrestling Entertainment won a limited decision which permitted them to continue marketing certain preexisting products with the abandoned WWF logo. However, the wrestling company was obliged to issue newly-branded merchandise such as apparel, action figures, video games, and DVDs with the "WWE" initials. For example, the court order required the company to remove both spoken and visual references to "WWF" in its library of video footage (which spans several decades).
The abandoned "wwf.com" domain name was purchased by a third party and became a wrestling forum, though it has since been abandoned again. In November 2006, the World Wildlife Fund's attempt to secure the rights for the wwf.com domain was rejected by the World Intellectual Property Organization."