Basics of FOSS
Adoption & Evidence
Companies & Contributions
Licensing & Rules
Famous Cases
100


  • What does FOSS stand for?



  • Free and Open Source Software.


100


  • What % of Fortune 1000 companies use OSS?



  • 55.9%.


100


  • Which company acquired Red Hat for $34 billion?



  • IBM.


100


  • What does GPL stand for?



  • General Public License.


100


  • What FOSS package caused a global vulnerability in 2021?



  • Log4j.


200


  • What’s the main difference between FOSS and proprietary software?



  • Access to source code (open vs. closed).


200


  • Which has higher adoption — OSS browsers or OSS operating systems?



  • Browsers (72.5% vs 28.9%).


200


  • Which platform central to OSS was acquired by Microsoft for $7.5 billion?



  • GitHub.


200


  • Which type of license is more permissive — GPL or MIT?



  • MIT.


200


  • Who maintains Log4j?



  • The Apache Foundation.


300


  • Name one everyday app that is open-source.



  • Firefox / VLC / LibreOffice.


300


  • What is the typical path of OSS adoption?



  • From applications → to platforms.


300


  • Name one way companies can contribute to OSS.



  • Sponsoring developers / open-sourcing their code / financial support.


300


  • What does the Apache license include that’s special?



  • Patent protection.


300


  • Which engineer removed the “left-pad” package, breaking thousands of sites?



  • Azer Koçulu.


400


  • True or False: Using FOSS always means it is free of cost.



  • False — companies can sell services/support on top of it.


400


  • What % of companies retain or expand their OSS use?



  • 79%.


400


  • What’s the tension when companies contribute heavily to OSS?



  • Profit motives may clash with community values.


400


  • Why might companies prefer permissive licenses (MIT/Apache)?



  • They allow integration into proprietary products.


400


  • How long did the removal of left-pad break the internet?



  • About 2 hours.


500


  • Why do most organizations adopt FOSS — ideology or pragmatism?



  • Pragmatism (cost, flexibility, efficiency).


500


  • What’s the “network effect” in OSS adoption?



  • Adoption in one area increases adoption in others.


500


  • n the Elastic vs. Amazon case, what was the problem?



  • Amazon repackaged Elastic’s software without fair contribution.


500


  • How do licenses shape the future of OSS?



  • They determine how open or commercialized development remains.


500


  • What irony does Log4j highlight?



  • Trillion-dollar companies rely on underfunded FOSS foundations.


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