Downloading media files involves the use of linking and framing Internet material, and relates to copyright law. Streaming and downloading can involve making copies of works that infringe on copyrights or other rights, and organizations running such websites may become vicariously liable for copyright infringement by causing others to do so. Open hosting servers allows people to upload files to a central server, which incurs bandwidth and hard disk space costs due to files generated with each download. Anonymous and open hosting servers make it difficult to hold hosts accountable. Taking legal action against the technologies behind unauthorized "file sharing" has proven successful for centralized networks (such as Napster), and untenable for decentralized networks like (Gnutella, BitTorrent). The leading YouTube audio-ripping site agreed to shut down after being sued by a huge coalition of recording labels. Downloading and streaming relates to the more general usage of the Internet to facilitate copyright infringement also known as "software piracy". As overt static hosting to unauthorized copies of works (i.e. centralized networks) is often quickly and uncontroversially rebuffed, legal issues have in recent years tended to deal with the usage of dynamic web technologies (decentralized networks, trackerless BitTorrents) to circumvent the ability of copyright owners to directly engage particular distributors and consumers.