Wasn't Firebase or Firebird a fork of the Borland Innerbase or whatever database? They could not sell it so they created a free and open source version of it, a

Wasn't Firebase or Firebird a fork of the Borland Innerbase or whatever database? They could not sell it so they created a free and open source version of it, and then someone ported it to different platforms, etc. It was supposed to compete with MySQL, PostgreSQL, Oracle, SQL Server, etc.