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  2. Copyright status of works by the federal government of the ...

    en.wikipedia.org/wiki/Copyright_status_of_works...

    The general prohibition against copyright in section 105 applies to "any work of the United States Government," which is defined in section 101 as "a work prepared by an officer or employee of the United States Government as part of that person's official duties." Under this definition a Government official or employee would not be prevented ...

  3. GNU General Public License - Wikipedia

    en.wikipedia.org/wiki/GNU_General_Public_License

    The GNU General Public Licenses ( GNU GPL or simply GPL) are a series of widely used free software licenses, or copyleft licenses, that guarantee end users the freedoms to run, study, share, and modify the software. [ 7] The license was the first copyleft for general use and was originally written by Richard Stallman, the founder of the Free ...

  4. Linux - Wikipedia

    en.wikipedia.org/wiki/Linux

    Some free and open-source software licenses are based on the principle of copyleft, a kind of reciprocity: any work derived from a copyleft piece of software must also be copyleft itself. The most common free software license, the GNU General Public License (GPL), is a form of copyleft and is used for the Linux kernel and many of the components ...

  5. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Coupon. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product . Customarily, coupons are issued by manufacturers of consumer packaged goods [ 1] or by retailers, to be used in retail stores as a part of sales promotions. They are often widely distributed through mail ...

  6. Open-source software - Wikipedia

    en.wikipedia.org/wiki/Open-source_software

    Open-source software ( OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. [ 1][ 2] Open-source software may be developed in a collaborative, public manner.

  7. Freeware - Wikipedia

    en.wikipedia.org/wiki/Freeware

    Freeware. Freeware is software, most often proprietary, that is distributed at no monetary cost to the end user. There is no agreed-upon set of rights, license, or EULA that defines freeware unambiguously; every publisher defines its own rules for the freeware it offers. For instance, modification, redistribution by third parties, and reverse ...

  8. Digital coupon - Wikipedia

    en.wikipedia.org/wiki/Digital_coupon

    Digital coupons (also known as e-coupons, e-clips or clipped deals) are the digital analogue of paper coupons which are used to provide customers with discounts or gifts in order to attract the purchase of some products. Mostly, grocery and drug stores offer e-coupon services in loyalty program events. Even though there are still traditional ...

  9. Source code - Wikipedia

    en.wikipedia.org/wiki/Source_code

    v. t. e. In computing, source code, or simply code or source, is a plain text computer program written in a programming language. A programmer writes the human readable source code to control the behavior of a computer . Since a computer, at base, only understands machine code, source code must be translated before a computer can execute it.