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  2. Coupon-eligible converter box - Wikipedia

    en.wikipedia.org/wiki/Coupon-eligible_converter_box

    January 2008; 16 years ago. ( 2008-01) Current status. Defunct. A coupon-eligible converter box ( CECB) was a digital television adapter that met eligibility specifications for subsidy "coupons" from the United States government. The subsidy program was enacted to provide terrestrial television viewers with an affordable way to continue ...

  3. Digital television transition in the United States - Wikipedia

    en.wikipedia.org/wiki/Digital_television...

    Those whose converter box coupons had expired would be allowed to apply for new coupons. The House postponed a similar bill (by House Energy and Commerce Committee Chairman Henry Waxman), until the Senate's version was complete. [73] [74] The Senate unanimously voted on January 26, 2009, to delay the digital TV transition to June 12, 2009. [75]

  4. Digital television adapter - Wikipedia

    en.wikipedia.org/wiki/Digital_television_adapter

    Digital television adapter. A digital television adapter ( DTA ), commonly known as a converter box or decoder box, is a television tuner that receives a digital television (DTV) transmission, and converts the digital signal into an analog signal that can be received and displayed on an analog television set. Some also have an HDMI output since ...

  5. National Security Agency - Wikipedia

    en.wikipedia.org/wiki/National_Security_Agency

    In 2015, the government made slight changes in how it uses and collects certain types of data, [245] specifically phone records. The government was not analyzing the phone records as of early 2019. [246] The surveillance programs were deemed unlawful in September 2020 in a court of appeals case. [52]

  6. Enigma machine - Wikipedia

    en.wikipedia.org/wiki/Enigma_machine

    The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top ...

  7. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    v. t. e. In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent ...

  8. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    Caesar cipher. The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext. In cryptography, a Caesar cipher, also known as Caesar's ...

  9. List of military headstamps - Wikipedia

    en.wikipedia.org/wiki/List_of_military_headstamps

    On the military headstamp the "SB" is at 12 o'clock and the "S" is at 6 o'clock. Sold to the Steyr-Werke A.G. of Vienna, Austria in 1922. SB / Schönebeck, P69 Sellier & Bellot – Schönebeck (1922–1945) – Schönebeck, Germany. The "SB" was at 12 o'clock and the text for Schönebeck occupied the lower half of the headstamp.