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In page Federal Communications Commission:

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In the case of digital TV, it chose the ATSC standard, even though DVB was already in use around the world, including DVB-S satellite TV in the U.S. Unlike competing standards, the ATSC system is encumbered by numerous patents, and therefore royalties that make TV sets and DTV converters much more expensive than in the rest of the world. Additionally, the claimed benefit of better reception in rural areas is more than negated in urban areas by multipath interference, which other systems are nearly immune to. It also cannot be received while in motion for this reason, while all other systems can, even without dedicated mobile TV signals or receivers.[citation needed]