Earlier this year, after months of legal wrangling, authorities in a number of countries won an injunction against the Pirate Bay, probably the largest and most famous BitTorrent piracy site on the Web. The order blocked people from entering the site.

In retaliation, the Pirate Bay wrapped up the code that runs its entire Web site, and offered it as a free downloadable file for anyone to copy and install on their own servers. People began setting up hundreds of new versions of the site, and the piracy continues unabated.

Thus, whacking one big mole created hundreds of smaller ones.