Asha, Lucene.net is an Apache Incubator project and is only distributed under an Apache License version 2. If you are using a GPL 3 License then there is documented compatibility between the licenses as described on the page http://www.apache.org/licenses/GPL-compatibility.html. Give this compatibility you can include Lucene.net in a GPL 3 project. I am not sure how on all of the mechanics of this inclusion but it can be done.
Scott > -----Original Message----- > From: Asha Kang [mailto:stereo...@gmail.com] > Sent: Tuesday, October 04, 2011 8:57 PM > To: lucene-net-dev@lucene.apache.org > Subject: [Lucene.Net] Asking about Lucene.net License > > Hi this is Asha Kang from Korea. > > the reason i`m writing this email is that I`d like to make sure which > license Lucene.net is following. > Now I`m developing Search Engine by using Lucene.net. > As I know, Lucene.net follows apache licene 2.0. > but my co-woker told me that some classes included in lucene.net`s dll > could follow GPL License. > So now I`m confused. > Are there any classes following GPL LICENSE? > Do I need to follow two license apache license 2.0 and GPL LICENSE? > > I'm looking forward to replying from you. > > bset regards > > Asha Kang.