Open source

refers to something

people can modify and share

because its design is publicly accessible.

Open source software with source code

that anyone can inspect, modify, and enhance.

Some open source licenses— "copyleft" licenses

stipulate that anyone

who releases a modified open source program

must also release the source code

for that program alongside it.

Some open source licenses stipulate

that anyone who alters and shares a program with others

must also share that program's source code

without charging a licensing fee for it.

Linux operating system

Apache Web server

LibreOffice

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