The sources can be obtained from My SQL's website or from My SQL's Git Hub repository, both under the GPL license.
When using some storage engines other than the default of Inno DB, My SQL does not comply with the full SQL standard for some of the implemented functionality, including foreign key references My SQL can be built and installed manually from source code, but it is more commonly installed from a binary package unless special customizations are required.
At the same time, several Free Software opinion leaders (including Eben Moglen, Pamela Jones of Groklaw, Jan Wildeboer and Carlo Piana, who also acted as co-counsel in the merger regulation procedure) advocated for the unconditional approval of the merger.
As part of the negotiations with the European Commission, Oracle committed that My SQL server will continue until at least 2015 to use the dual-licensing strategy long used by My SQL AB, with proprietary and GPL versions available.
In January 2009, before Oracle's acquisition of My SQL, Monty Widenius started a GPL-only fork, Maria DB.
The petition of 50,000 developers and users called upon the European Commission to block approval of the acquisition.In 2002, My SQL AB sued Progress Nu Sphere for copyright and trademark infringement in United States district court.Nu Sphere had allegedly violated My SQL's copyright by linking My SQL's GPL'ed code with Nu Sphere Gemini table without being in compliance with the license.makers of the Berkeley DB, a database engine providing the basis for another My SQL storage engine.This had little effect, as Berkeley DB was not widely used, and was dropped (due to lack of use) in My SQL 5.1.12, a pre-GA release of My SQL 5.1 released in October 2006.
My SQL is a central component of the LAMP open-source web application software stack (and other "AMP" stacks).