闭源（Closed source）是作为开源的反义词而出现的一个术语，指被用于任何没有资格作为开源许可术语的程序。
封闭源 enclosed source
关闭源文件 Close source file ; fclose
闭源软件 closed source software
关闭电源 power off ; power take off ; poweroff ; switch off the electricity
硬盘电源关闭模式 HDD Power Down
电源关闭 power off ; Power-down ; Power is off ; Power supply OFF
封闭放射源 sealed source
封闭式离子源 tight ion source
自动关闭电源 Auto Power Off
开源解决方案优于闭源私有方案；
Open Source solutions are preferred to closed source proprietary solutions
无论是开源开发还是闭源开发，GCC都是开发的基础。
GCC is the cornerstone of development in both the open source and closed source worlds.
开源内核软件是以开源软件为基础构建的闭源软件。
Open core software is proprietary software built on top of open source software.
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