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Are all the ext code free to anyone to use ?
Unless you need a commercial license, yes it's free. Please spend some time reading the home page and the licensing information. If you have further questions regarding licensing, email firstname.lastname@example.org
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API Doc (4.x | 3.x | 2.x | 1.x) / FAQ / 1.x->2.x Migration Guide / 2.x->3.x Migration Guide
it's LGPL license which mean u can use it even in commercial product without paying
if u changed the ext code,u release the changed code under LGPL or pay a commercial fee,if u want professional support,u can pay for it