Was it sqlite that you were thinking of? It's public domain, but offers licenses. > The core SQLite database software is in the public domain. No license is ne

Was it sqlite that you were thinking of? It's public domain, but offers licenses. > The core SQLite database software is in the public domain. No license is necessary to use SQLite or to build SQLite into your products. However, licenses are available to satisfy the following needs: > - You want indemnity against claims of copyright infringement. > - You are using SQLite in a jurisdiction that does not recognize the public domain. > - You are using SQLite in a jurisdiction that does not recognize the right of a authors to dedicate their work to the public domain. > - You want to hold a tangible legal document as evidence that you have the legal right to use and distribute SQLite. Your legal department tells you that you have to purchase a license. https://www.sqlite.org/purchase/license https://www.sqlite.org/purchase/license