Sql Server Express 2012 License Agreement
SQL Server Express can only be used for free for development and testing, as well as for microworkloads such as mobile or web applications with minimum requirements for relational databases. The free license does not apply to instances running on virtual machines. Temporary licenses, implementation licenses, beta, evaluation, test or demonstration products are provided without any warranty. Commvault is not required to support, maintain, maintain, or other media for licenses, time-limited site licenses, beta, evaluation, test, or demonstration products. .