The legality of using streaming devices, apps, or services marketed under names like SkyStream depends entirely on the specific content being accessed and the nature of the broadcast rights. While purchasing open-source streaming hardware or media boxes is generally lawful for running authorized applications, utilizing modified firmware, third-party add-ons, or unofficial software extensions designed to stream copyrighted television channels, pay-per-view events, or subscription movies without paying authorized licensing fees constitutes digital copyright infringement and is illegal in many jurisdictions.