The open-core model is a business model for the monetization of commercially produced open-source software. Coined by Andrew Lampitt in 2008,[1] the open-core model primarily involves offering a "core" or feature-limited version of a software product as free and open-source software, while offering "commercial" versions or add-ons as proprietary software.[2][3]

From here -> https://en.m.wikipedia.org/wiki/Open-core_model