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In any of these cases,[link widoczny dla zalogowanych], access to the file may be controlled by user authentication, the transit of the file over the Internet may be obscured by encryption,[link widoczny dla zalogowanych] and money may change hands for access to the file. The price can be paid by the remote charging of funds from, for example, a credit card whose details are also passed—usually fully encrypted—across the Internet. The origin and authenticity of the file received may be checked by digital signatures or by MD5 or other message digests. These simple features of the Internet, over a worldwide basis, are changing the production, sale, and distribution of anything that can be reduced to a computer file for transmission. This includes all manner of print publications, software products, news, music, film, video, photography, graphics and the other arts. This in turn has caused seismic shifts in each of the existing industries that previously controlled the production and distribution of these products.
Streaming media is the real-time delivery of digital media for the immediate consumption or enjoyment by end users.[link widoczny dla zalogowanych] Many radio and television broadcasters provide Internet feeds of their live audio and video productions. They may also allow time-shift viewing or listening such as Preview, Classic Clips and Listen Again features. These providers have been joined by a range of pure Internet "broadcasters" who never had on-air licenses. This means that an Internet-connected device, such as a computer or something more specific, can be used to access on-line media in much the same way as was previously possible only with a television or radio receiver. The range of available types of content is much wider, from specialized technical webcasts to on-demand popular multimedia services. Podcasting is a variation on this theme, where—usually audio—material is downloaded and played back on a computer or shifted to a portable media player to be listened to on the move.
Many watercourses and coastal stretches have also been contaminated by industrial and agricultural activity, while due to rising water levels Venice has been regularly flooded throughout recent years. Waste from industrial activity is not always disposed of by legal means and has led to permanent health effects on inhabitants of affected areas, as in the case of the Seveso disaster. The country has also operated several nuclear reactors between 1963 and 1990 but, after the Chernobyl disaster and a referendum on the issue the nuclear program was terminated,[link widoczny dla zalogowanych] a decision that was overturned by the government in 2008. A deal was signed with France in 2009 for the construction of up to four new nuclear plants. Deforestation, illegal building developments and poor land management policies have led to significant erosion all over Italy's mountainous regions, leading to major ecological disasters like the 1963 Vajont Dam flood, the 1998 Sarno[61] and 2009 Messina mudslides.