GNU Lesser General Public License
Can I use GNU Lesser General Public License?
The license allows developers and companies to use and integrate a software component released under the LGPL into their own (even proprietary) software without being required by the terms of a strong copyleft license to release the source code of their own components. ...
GNU Lesser General Public License - Wikipedia
Is LGPL free for commercial use?
You can use and distribute LGPL libraries on your website and use them in combination with commercial code. The only big restriction is that you must keep the library open source, including any modifications you make to it, and allow your users to obtain the source, licence and copyright information for the library.
How can I legally use LGPL javascript in a commercial web site?
What is GNU Lesser General Public License v2 1?
1 (LGPL v2. 1 for short) is a variation of the regular GNU General Public License (GPL). Originally known as the GNU Library General Public License, it was drafted by the Free Software Foundation (FSF) to provide a weaker (or Lesser) form of copyleft for use in certain specific circumstances.
The GNU Lesser General Public License v2.1 - An Overview
One is the GNU Lesser GPL; the other is the ordinary GNU GPL. The choice of license makes a big difference: using the Lesser GPL permits use of the library in proprietary programs; using the ordinary GPL for a library makes it available only for free programs.
Why you shouldn't use the Lesser GPL for your next library - GNU.org