GPL of GNU says that every copy of a program governed by GPL license, even if modified, must be subject to GPL again.

Computer Software topics include: System and application softwares, firmware and middleware, open source software and initiative. Computer software is a set of instructions that tells a computer what to do. It's a computer program that executes a user's commands.  Here are some types of software: Application software, System software, Driver software, Middleware, Programming software.  Here are some other types of software: Operating system: An operating system (OS) is a type of software that allows computer hardware to communicate with and operate with computer software. It's a platform... Show more

Computer Software topics include: System and application softwares, firmware and middleware, open source software and initiative.

Computer software is a set of instructions that tells a computer what to do. It's a computer program that executes a user's commands. 

Here are some types of software: Application software, System software, Driver software, Middleware, Programming software. 

Here are some other types of software:
Operating system: An operating system (OS) is a type of software that allows computer hardware to communicate with and operate with computer software. It's a platform for running applications and controls all user interface tools. Examples of operating systems include Mac OS, Microsoft Windows, Android, and various Linux distributions.
Device drivers: A type of software that manages specific hardware connected to the system. Examples of hardware devices that require a driver to connect to a system include displays, sound cards, printers, mice, and hard discs. 

Here are some types of software licenses:

Freeware: A type of proprietary software that is released without charge to the public. Depending on the freeware's copyright, you may or may not be able to reuse it in software you're developing.
Open source software: Software that is distributed with its source code, making it available for use, modification, and distribution. Examples of open source software include GNU/Linux, Mozilla Firefox, VLC media player, SugarCRM, GIMP, VNC, Apache web server, LibreOffice, and jQuery.
Shareware: Commercial software that is distributed free to users, eventually either requiring or encouraging users to pay for the continued support of the software. 

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