Please suggest how to determine the licensing used by pentaho-metadata jar v 3.4.6. If I want to re-use this code as is, is there a need to I procure a license from Pentaho? If yes, which one?

I found the following excerpt in source files obtained from for v 5.0.1:

* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
* Copyright (c) 2009 Pentaho Corporation.. All rights reserved.