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2. Microsoft Product Activation - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Product_Activation

   The Activation Wizard in Office 2010. When installing a retail copy of Windows or Office, the user is asked to input a unique product key supplied on a certificate of authenticity included with the program, which is later verified during activation. [1]

3. Key generator - Wikipedia

   en.wikipedia.org/wiki/Key_generator

   One can implement a key generator in a system that aims to generate, distribute, and authenticate [4] keys in a way that without the private key, one cannot access the information in the public end. [5] Examples of key generators include linear-feedback shift registers (LFSR) and the Solitaire (or Pontifex) cipher.

4. Product activation - Wikipedia

   en.wikipedia.org/wiki/Product_activation

   An early example of product activation was in the MS-DOS program D'Bridge Email System written by Chris Irwin, a commercial network system for BBS users and Fidonet. The program generated a unique serial number which then called the author's BBS via a dialup modem connection. Upon connection, the serial number was validated.

5. Microsoft Office 2019 - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Office_2019

   Microsoft Office 2019 was officially released on September 24, 2018, for Microsoft Windows and macOS, following a preview phase earlier that year. Office 2019 was designed for users who preferred a perpetual license model, offering a one-time purchase option, in contrast to the subscription-based Office 365 (now Microsoft 365). While it ...

6. Key generation - Wikipedia

   en.wikipedia.org/wiki/Key_generation

   Modern cryptographic systems include symmetric-key algorithms (such as DES and AES) and public-key algorithms (such as RSA).Symmetric-key algorithms use a single shared key; keeping data secret requires keeping this key secret.

7. Product key - Wikipedia

   en.wikipedia.org/wiki/Product_key

   Product key on a Proof of License Certificate of Authenticity for Windows Vista Home Premium. A product key, also known as a software key, serial key or activation key, is a specific software-based key for a computer program.