The company has after communication with Peter Sunde (a.k.a. brokep) decided to unregister the trademark and said that all they wanted to achieve was to get an ok to use the image (although all the free advertising was probably part of the plan too ;)).

Source: Swedish Radio news (google translated)

There’s another interesting part of the story: when the registration became public many people mailed to the patent and registration office with questions about it. When Fredrik Neij – one of the Pirate Bay guys – mailed a question to them he got a reply within two minutes. But not from the Patent and Registration office but instead from Swedish Radio – citing his original mail in full. Now it could be that correspondence like this with authorities is openly available under Swedish transparency laws, but in that case one has to make a formal request in order to access it. I have never heard of normal correspondence being automatically forwarded to journalists like this.

“I don’t know how Swedish trademark law works, but at least in the US there is a concept of a “common law trademark,” which is supposed to prevent others from registering a mark on a brand that someone else is using — even if they haven’t registered it. It would seem like quite a silly trademark law if the Swedish trademark law doesn’t include anything like that.”

Swedish trademark law indeed has something similar. Although I don’t have any detailed knowledge of it I doubt that “common law trademarks” would cover more areas than the ones established by the common usage however. The trademark application in this case covered just one so called trademark class. I don’t think it would have limited the possibility to continue using the image as a logo for the file-sharing site (but I’m no expert on legal matters).