HTSQL is free and open source software released under the terms of the AGPLv3. HTSQL is additionally licensed under permissive terms for any application using an open source database such as SQLite or PostgreSQL.
| License Agreement | FSF/OSI Approved | Database Systems | Proprietary Applications? | Attribution Required? |
|---|---|---|---|---|
| Free & Open Source under the AGPLv3 | ✓ Yes |
|
Derived works † subject to copyleft | Yes |
| Permissive for use with Open Source Databases | No |
|
✓ Permitted | Not required, but certainly appreciated |
| Proprietary for non-free Databases ‡ | No |
|
✓ Permitted | No |
† What constitutes a derivative work necessarily depends upon the specifics of the situation and legal interpretation. Private works which are not made available to the public do not fall under the terms of the AGPL’s copyleft provisions and therefore may remain proprietary.
‡ We do not sell “proprietary addons”. All features are included in the free and permissive licensed versions of HTSQL, to the extent that those features could work with open source databases.
Our repository distribution includes evaluation adapters for proprietary databases, such as Oracle or Micrososoft SQL Server. We offer HTSQL with the intent to sell proprietary licenses for use of HTSQL in conjunction with commercially licensed databases.
In our repository distribution, some components considered broadly useful, but ancillary to HTSQL itself, are released under the MIT license. Example code snippets, configuration, and applications are placed into the public domain using the CC0 copyright dedication. These exceptions to the general license outline above are marked on a file by file basis.
This license option permits any sort of distribution, modification, and usage of HTSQL in conjunction open source databases. In particular, we explicitly allow proprietary applications to use HTSQL in conjunction with PostgreSQL and SQLite.
Copyright (c) 2006-2012 Prometheus Research, LLC.
All rights reserved.
Redistribution and use, with or without modification, are permitted
provided that the following conditions are met:
1. The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the software.
2. If this software or any Derivative Work is used or distributed for
use with a database system, that database system must be Open Source.
A database system is "Open Source" if, at the time of distribution or
use in conjunction with this software, the system may be distributed
or used without charge, the preferred source code for the database
system is generally available, and this code is either in the public
domain or licensed under terms approved by the Open Source Initiative.
By "Derivative Work" we mean any derivative work under U.S. copyright
law (or, for distribution or use outside the United States, the most
closely equivalent concept under applicable law), including, without
limitation, any improvement, translation, transformation, adaptation,
modification, arrangement, plugin, wrapper, shim, or extension based
on this software.
THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY, AGAINST INFRINGEMENT, TITLE AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
HTSQL may be used, modified, and/or deployed subject to the AGPLv3 with a supplemental term requiring author attribution in an “About Box” or similar feature. This free software license ensures user’s freedom to run, copy, share, study, change and improve this software by requiring publicly available derivative works are, as a whole, compatibly licensed.
Copyright (c) 2006-2012 Prometheus Research, LLC.
All rights reserved.
This program is free software: you can use, redistribute, and/or modify
it under the terms of the GNU Affero General Public License, version 3
or later ("AGPL"), as published by the Free Software Foundation, and as
supplemented by additional terms according to section 7 of the AGPL:
This Program was created by members and contributors to the HTSQL
Project (http://htsql.org). As permitted by section 7b of the AGPL,
we require preservation of copyright notices and author attributions
in this Program's documentation and Appropriate Legal Notices. This
Program displays such notices in its "htsql-ctl version" command line
option, and also in its "About HTSQL" dialog box. In the graphical
display of these notices, author attributions include "Powered By"
logos for HTSQL and for other software projects.
For works containing this Program or any covered work, each interactive
user interface must include a prominent and conveniently accessible
feature for the display of Appropriate Legal Notices. This display
must include author attributions and copyright notices as found in this
Program. This display of these author attributions must be convenient
for a user wishing to browse credits, shown in a manner separate and
distinct from license texts, and commensurately prominent with respect
to other author attributions. To the extent that it is technically
feasible and not obtrusive, the graphical form of these author
attributions, such as a "Powered By" logo, must be preserved;
otherwise, a textual equivalent is permitted.
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Additional permissions, which may be removed at your option, under
GNU AGPL version 3 section 7:
If you modify this Program, or any covered work, by linking or combining
it with parts that are otherwise independent works covered by the terms
of GNU GPL version 2, the licensors of this Program grant you additional
permission to convey the entire combined work containing those parts.
In offering the HTSQL under the AGPLv3, we see any HTSQL plugin or extension as having intimate communication with HTSQL itself and understand them to be modifications that create covered works subject to the copyleft requirements of the AGPLv3. Specifically, we consider adapters or addon features usable only in conjunction with a proprietary database system, database extension, or web service to be non-free. Conveyance of, or remote network interaction with, such covered works is incompatible with this free software license since the whole work is not included — a proprietary license is effectively required for a user to operate the covered work.
This is limited distribution and use license for proprietary database adapters so that they may be publicly shared and evaluated. We require a proprietary license for any commercial use.
Copyright (c) 2006-2012 Prometheus Research, LLC.
All rights reserved.
This license is meant for the express purpose of permitting public
evaluation (but not commercial use) of proprietary database adapters.
By distributing, installing, modifying, or using this software you
agree to be bound to the terms of this agreement.
Limited redistribution and use, as well as the creation of Derivative
Works, are permitted provided that the following conditions are met:
1. The above copyright notice and this permission notice shall be
included in all copies or substantial portions of this software.
2. You may only use this software for evaluation purposes, which are
limited to: the discovery of how HTSQL works, testing of function or
performance, the creation of prototype applications used for
demonstrations, and communicating bug reports and/or feature requests.
3. You may not use or distribute this software, or any Derivative
Work, in any form for commercial purposes. Examples of commercial
purposes would be running business operations, licensing, leasing,
or selling this software, or distributing this software for use
with commercial products or services.
4. You may distribute this software or Derivative Works, provided
that such copies of this software or Derivative Works are licensed
under this HTSQL Evaluation License.
By "Derivative Work" we mean any derivative work under U.S. copyright
law (or, for distribution or use outside the United States, the most
closely equivalent concept under applicable law), including, without
limitation, any improvement, translation, transformation, adaptation,
modification, arrangement, plugin, wrapper, shim, or extension based
on this software.
THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY, AGAINST INFRINGEMENT, TITLE AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
We will offer proprietary licenses specifically to distribute and use HTSQL in conjunction with a proprietary database system, or to distribute works based upon HTSQL that require a non-free component. At this time, we don’t have this license prepared, but the principle is that we are selling an exception to our free software license so that HTSQL can be combined with a proprietary database system.
To ask about this, please visit http://prometheusresearch.com.