Proprietary ↔ License to restrict mod/redis. Retain author & close-source

References

1. Algolia ↔ $$$ Online API Search Engine Proprietary SaaS Host & Analytics via RESTful API - $$$ charge by ANY operation or # records ☠

2. MP3 ↔ Popular Lossy Audio Format. Signal cutt-off beyond average hearing range. Proprietary?

3. Google Container-Optimized OS ↔ Google Proprietary OS optimize to run Docker Container - incl docker runtime, rm Linux distro binaries (ie pkg manager) for smaller footprint & sec

4. Chrome ↔ Google-flavor Chromium with free ads, tracking & telemetry (BUT SOME nice Proprietary dev-tools)