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Free and Open-Source Software

Abbreviations / Acronyms / Synonyms:

FOSS

Definitions:

  Software that is liberally licensed to grant users the right to use, copy, study, change, and improve its design through the availability of its source code. In the context of free and open source software, free refers to the freedom to copy and reuse the software. FOSS is an inclusive term that covers both free software and open source software.
Sources:
CNSSI 4009-2022 under free and open source software (FOSS) from NSA/CSS Policy 6-10