ADSL (“Asymmetric Digital Subscriber Line”) is the most common type of connection presently offered to consumers for broadband connections. It is based on DSL technology and was developed to operate over an existing phone line without disturbing voice calls being made simultaneously on that same line. It is designed to meet private customers’ usually asymmetric needs for higher receiving rates than sending rates.

A public key fingerprint or fingerprint ID is a short sequence of numbers for uniquely and quickly identifying a longer public key. The fingerprint is compared in order to verify a key previously exchanged electronically on the phone or at a personal meeting.

DVB-C stands for “Digital Video Broadcasting Cable” and is a version of DVB that is used for the transmission of digital services over a cable connection, generally television signals. DVB-C is a transmission system that also allows the digital transmission of radio programmes.

Monitoring is the generic term for all types of direct systematic recording, observation or monitoring of an event or process using technical means or other observation systems.

Internet service providers, abbreviated ISP, provide services, content or technical services required for the use or operation of Internet content and services.

A VDSL (“Very High Speed Digital Subscriber Line”) is a DSL technology that enables substantially faster data transmission rates over conventional phone lines than, for example, ADSL or ADSL2+ do. As with all DSL technologies, VDSL also uses a (twisted pair of) copper wire(s) as the final portion of the transmission line to the customer.