xtas is Copyright 2013-2016 Netherlands eScience Center and University of Amsterdam
With the exception of the NERServer helper program and the modified Sentiwords data set, xtas is licensed under the Apache License, Version 2.0 (the "License"); you may not use xtas except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
or see LICENSE-al2.txt.
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
NERServer is Copyright 2014 Netherlands eScience Center and University of Amsterdam
The NERServer helper program, comprising NERServer.java and NERServer.class, is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
NERServer 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with NERServer. If not, see <http://www.gnu.org/licenses/>.
xtas incorporates a (mechanically) modified version of SentiWords v1.0, in sentiwords.txt.
Copyright © 2014 Trento RISE and FBK All rights reserved.
Modified for xtas to save space:
- took the (unweighted) mean over POS tags per word
- removed all words with zero (mean) score.
SentiWords is distributed under the Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license. http://creativecommons.org/licenses/by-sa/3.0/
xtas acts as a package manager and shell for several tools and data sets. It will download and run these programs and data sets for you when you use the corresponding xtas functions. For your information, as of writing, these were distributed under the following licenses:
- Heideltime: GNU General Public License version 3 or higher
- ILK Frog: GNU General Public License version 3 or higher
- RUG Alpino: GNU Lesser General Public License version 2.1 or higher
- SEMAFOR: GNU General Public License version 3 or higher
- Stanford CoreNLP 3.4.1: GNU General Public License version 3 or higher
- Stanford NER: GNU General Public License version 2 or higher
Heideltime requires Treetagger, which as of writing is licensed under a restrictive license which only allows research and teaching use. xtas will not download or install Treetagger. If you meet the license requirements, you can install Treetagger yourself, and point xtas at it; xtas will then install Heideltime for you and configure it to use your Treetagger installation.
xtas will download and use several data sets as required to implement some of its functionality. These are
- polarity dataset v2.0 (no explicit license)
- emotion classification dataset of Buitinck et al. (You may use this data for academic/research purposes.)
- University of Antwerp CoNLL'02 data (Files in these directories may only be used for research applications in the context of the CoNLL-2002 shared task. No permission is given for usage other applications especially not for commercial applications.)
xtas will require you to explicitly acknowledge these restrictions when using the corresponding functionality.
xtas can call the University of Amsterdam Semanticizer Web API. Its authors request citation of their publication(s) if you use this webservice for your own research.
xtas uses (links to) a number of Python libraries. These are not distributed with xtas, but installed by pip when you install xtas. As of writing, these dependencies are distributed under the MIT, New BSD, 2-clause NetBSD and Apache License v2.0 permissive open source licenses, and in some cases under the GNU Lesser General Public License v2.1. See requirements.txt and requirements3.txt for the package names.