-In most cases, the majority of a software application's code is reused software that is licensed as open source software (OSS). OSS is, briefly, software where users have the freedom to run, copy, distribute, study, change and improve the software (this is actually the [Free Software Definition](https://www.gnu.org/philosophy/free-sw.en.html)). A very widely-used and more detailed definition of OSS is the [Open Source Definition (OSD)](https://opensource.org/osd) from the [Open Source Initiative (OSI)](https://opensource.org), who also maintain a list of [OSI Approved Licenses](https://opensource.org/licenses). Studies show that the average percentage of OSS in software applications is somewhere between 77% ([Black Duck 2024](https://www.blackduck.com/resources/analyst-reports/open-source-security-risk-analysis.html)) and 90% ([Sonatype 2024](https://www.sonatype.com/state-of-the-software-supply-chain/introduction)).
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