Mercurial > hg > orthanc-book
annotate Sphinx/source/faq/licensing.rst @ 524:39fef223dca0
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
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| date | Thu, 15 Oct 2020 16:11:16 +0200 |
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| 199 | 1 .. _licensing: |
| 2 | |
| 3 | |
| 4 Licensing of the Orthanc ecosystem | |
| 5 ================================== | |
| 6 | |
| 7 .. contents:: | |
| 8 | |
| 9 | |
| 10 Philosophy | |
| 11 ---------- | |
| 12 | |
| 13 The objectives of the Orthanc ecosystem is to share technical | |
| 201 | 14 knowledge about :ref:`DICOM <dicom-guide>`, to build a consistent |
| 15 platform for developing medical imaging software, and to foster | |
| 16 scientific collaborations in medical imaging by subscribing to the | |
| 17 `open-science paradigm | |
| 18 <https://en.wikipedia.org/wiki/Open_science>`__. To this end, Orthanc | |
| 19 is provided as free and open-source software to the benefit of the | |
| 20 worldwide community of medical imaging. | |
| 199 | 21 |
| 22 In order to support this objective of global knowledge sharing, the | |
| 23 Orthanc project enforces reciprocity. If someone finds Orthanc useful | |
| 24 to her academic work or to her business, the community of medical | |
| 25 imaging should gain an advantage from this use by enlarging the | |
| 26 knowledge base. This virtuous circle guarantees the fact that Orthanc | |
| 27 will be developed in a sustainable way in the long-term, to the | |
| 28 benefit of all stakeholders. Predatory behaviors should be prevented, | |
| 201 | 29 while preserving the freedoms of the users of Orthanc, including the |
| 199 | 30 commercial uses. |
| 31 | |
| 32 According to this philosophy, the University Hospital of Liège decided | |
| 201 | 33 to release the Orthanc ecosystem under the `GPLv3+ license |
| 34 <https://www.gnu.org/licenses/gpl-3.0.en.html>`__ in 2012. The GPL is | |
| 35 a strong copyleft license that is recognized worldwide, and that is | |
| 36 designed to enforce reciprocity. | |
| 199 | 37 |
| 38 As Orthanc is lightweight and designed for Web applications and for | |
| 39 sharing medical images over Internet, it has been quickly deployed on | |
| 40 cloud platforms in order to host large amount of data. Orthanc | |
| 41 considers this use as very legitimate, for instance for scientific | |
| 42 purpose (think of open-data databases) or for societal needs (think of | |
| 43 teleradiology platforms in developing countries). Unfortunately, the | |
| 44 GPL does not protect from predatory commercial behaviors over cloud | |
| 45 platforms because of the so-called "`ASP loophole | |
| 201 | 46 <https://en.wikipedia.org/wiki/GNU_Affero_General_Public_License>`__", |
| 47 that does not enforce modified versions of a free and open-source | |
| 48 software running on a server to be given back to the community. | |
| 199 | 49 |
| 50 For this reason, the plugins that provide scalability-related or | |
| 51 cloud-related features (for instance the :ref:`PostgreSQL | |
| 201 | 52 <postgresql>` and :ref:`Web viewer <webviewer>` plugins that are |
| 199 | 53 necessary for Web applications distributed at a large scale) were |
| 201 | 54 released under the stronger `AGPLv3+ licence |
| 55 <https://www.gnu.org/licenses/why-affero-gpl.en.html>`__. | |
| 199 | 56 This license protects the community of medical imaging by ensuring |
| 57 that the features included in Orthanc instances running in remote | |
| 58 servers are publicly available as well. | |
| 59 | |
| 60 | |
| 61 Guidelines | |
| 62 ---------- | |
| 63 | |
| 64 Over the years, it was observed that people fear the use of GPL and | |
| 65 AGPL licenses, that are wrongly considered as preventing commercial | |
| 66 uses. This is most often a wrong assumption, given that the Orthanc | |
| 200 | 67 server is a standalone executable, not a software library. |
| 199 | 68 |
| 69 The following table provides a simple summary of the most common | |
| 523 | 70 situations, and indicates whether the use is **accepted ("Yes"), |
| 71 forbidden ("No"), or restricted ("Dual licensing")**: | |
| 199 | 72 |
| 73 +-----------------------------------------------------+--------------------------------------------------------------------------------------------+ | |
| 201 | 74 | | Mode of distribution of the third-party system, or of the third-party plugin/script | |
| 199 | 75 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ |
| 201 | 76 | Usage of the Orthanc ecosystem | Permissive | GPLv3 | AGPLv3 | Internal use | Proprietary software | Proprietary cloud | |
| 353 | 77 | | (MIT, BSD, | | | | distributed to clients | platform or Web | |
| 78 | | Apache...) | | | | | portal | | |
| 199 | 79 +=====================================================+===============+=======+========+==============+========================+===================+ |
| 80 | Using Orthanc as such, even if some AGPL-licensed | N/A | N/A | N/A | Yes | Yes | Yes | | |
| 81 | plugin is installed | | | | | | | | |
| 82 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ | |
| 83 | Calling Orthanc from a third-party application | Yes | Yes | Yes | Yes | Yes | Yes | | |
| 84 | (using REST API or DICOM protocol), even if some | | | | | | | | |
| 85 | AGPL-licensed plugin is installed | | | | | | | | |
| 86 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ | |
| 87 | Creating an Orthanc plugin or a Lua script, that | No | Yes | Yes | Yes | Dual licensing | Yes | | |
| 88 | is hosted by an Orthanc server where no | | | | | | | | |
| 89 | AGPL-licensed plugin is installed | | | | | | | | |
| 90 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ | |
| 91 | Creating an Orthanc plugin or a Lua script, that | No | Yes | Yes | Yes | Dual licensing | Dual licensing | | |
| 92 | is hosted by an Orthanc server where some | | | | | | | | |
| 93 | AGPL-licensed plugin is installed | | | | | | | | |
| 94 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ | |
| 519 | 95 | Creating a :ref:`Python plugin <python-plugin>` | No | No | Yes | Yes | Dual licensing | Dual licensing | |
| 353 | 96 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ |
| 202 | 97 | Using a modified version of the GPL-licensed | No | Yes | Yes | Yes | Dual licensing | Yes | |
| 98 | code of Orthanc, or using a modified version of | | | | | | | | |
| 99 | some GPL-licensed plugin, or reusing their original | | | | | | | | |
| 100 | code in a third-party system | | | | | | | | |
| 199 | 101 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ |
| 202 | 102 | Using a modified version of some AGPL-licensed | No | No | Yes | Yes | Dual licensing | Dual licensing | |
| 103 | plugin, or reusing its original code in a | | | | | | | | |
| 104 | third-party system | | | | | | | | |
| 199 | 105 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ |
| 524 | 106 | **For viewers**: Using a modified version of the | No | No | Yes | Yes | Dual licensing | Dual licensing | |
| 107 | :ref:`Orthanc Web Viewer <webviewer>`, of the | | | | | | | | |
| 108 | :ref:`Osimis Web Viewer <osimis-webviewer>`, of the | | | | | | | | |
| 523 | 109 | :ref:`Stone Web Viewer <stone>`, or of the sample | | | | | | | |
| 110 | applications of Stone of Orthanc (AGPL license) | | | | | | | | |
| 199 | 111 +-----------------------------------------------------+---------------+-------+--------+--------------+------------------------+-------------------+ |
| 112 | |
| 201 | 113 **Notes:** |
| 114 | |
| 115 * The wording "third-party system" is very broad, as it encompasses | |
| 116 many possibilities. It can for instance be a Web application, a | |
| 117 heavyweight desktop application, an automated script, or more | |
| 202 | 118 generally any system that takes advantage of Orthanc as a service in |
| 119 its global architecture. | |
| 201 | 120 |
| 202 | 121 * If your use case falls in a "**Dual licensing**" cell, please get in |
|
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122 touch with `Osimis <https://www.osimis.io/>`__, the commercial |
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123 partner of the Orthanc project that is the only entity entitled to |
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124 grant a `license exception |
| 201 | 125 <https://www.fsf.org/blogs/rms/selling-exceptions>`__ to your |
| 202 | 126 company for the Orthanc core and its :ref:`associated official |
| 127 plugins <plugins-official>`. | |
| 201 | 128 |
| 129 * If you reuse code from Orthanc or one of its associated plugins, you | |
| 130 must mention the copyright of the Orthanc project. | |
| 199 | 131 |
| 201 | 132 * An Orthanc plugin cannot be licensed under a permissive license |
| 203 | 133 (MIT, BSD, Apache...) because it cannot run independently of the |
| 134 Orthanc SDK, which implies that the plugin and the Orthanc core form | |
| 135 a single combined program, which in turn means that the plugin | |
| 136 should be licensed under GPLv3 by `copyleft | |
| 137 <https://en.wikipedia.org/wiki/Copyleft>`__ contamination. Check out | |
| 138 the `license compatibility matrix on Wikipedia | |
| 201 | 139 <https://en.wikipedia.org/wiki/License_compatibility#Compatibility_of_FOSS_licenses>`__. |
| 203 | 140 Here is the corresponding entry about this topic in the `GPL FAQ |
| 141 <https://www.gnu.org/licenses/gpl-faq.en.html#GPLPlugins>`__: *"If | |
| 142 the main program dynamically links plug-ins, and they make function | |
| 143 calls to each other and share data structures, we believe they form | |
| 144 a single combined program, which must be treated as an extension of | |
| 145 both the main program and the plug-ins. [...] If the main program | |
| 146 and the plugins are a single combined program then this means you | |
| 147 must license the plug-in under the GPL or a GPL-compatible free | |
| 148 software license and distribute it with source code in a | |
| 149 GPL-compliant way."* | |
| 201 | 150 |
| 151 * If you deal with medical applications in Europe, note that Osimis | |
| 152 sells **CE-approved** versions of a Web viewer plugin. | |
| 153 | |
| 154 * You are kindly invited to cite the `reference paper about Orthanc | |
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155 <https://link.springer.com/article/10.1007/s10278-018-0082-y>`__ |
| 201 | 156 in your scientific work. |
| 157 | |
| 202 | 158 * This is our own simplified, technical interpretation of the GPLv3+ |
| 159 and AGPLv3+ in the very specific context of Orthanc. It is not | |
| 160 intended to be a complete guide to copyleft licensing. Please get in | |
| 161 touch with the `Free Software Foundation <https://www.fsf.org/>`__ | |
| 162 for more legal information. | |
| 199 | 163 |
| 164 | |
| 165 .. _cla: | |
| 166 | |
| 167 Contributing to the code of Orthanc | |
| 168 ----------------------------------- | |
| 169 | |
| 202 | 170 Contributed vs. internal code |
| 199 | 171 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| 172 | |
| 202 | 173 It is important to make the distinction between contributed code and |
| 174 internal code: | |
| 199 | 175 |
| 202 | 176 * **Contributed code** refers to source code that takes advantage of |
| 199 | 177 Orthanc and/or that extends Orthanc, such as new :ref:`plugins |
| 178 <plugins>`, :ref:`Lua scripts <lua>`, or any higher-level | |
| 179 application that uses the :ref:`REST API <rest>` of Orthanc. This | |
| 180 code can live outside of the official source repositories of the | |
| 202 | 181 Orthanc ecosystem. External contributors can distribute such |
| 182 contributed code on whatever platform they prefer, in a way that is | |
| 183 fully uncoupled from the Orthanc project, and keep the intellectual | |
| 199 | 184 property of their developments. Such contributors are however kindly |
| 185 invited to index their contributions in the `dedicated repository on | |
| 203 | 186 GitHub <https://github.com/jodogne/OrthancContributed>`__, and |
| 187 contributed plugins should also be indexed in the :ref:`Orthanc Book | |
| 188 <plugins-contributed>`. | |
| 199 | 189 |
| 190 * **Internal code** refers to source code that only makes sense if | |
| 191 embedded within the Orthanc core or within one of the official | |
| 192 plugins. This includes new features and bugfixes. The way to | |
| 193 contribute to the internal code of the Orthanc ecosystem is | |
| 194 described in the sections below. | |
| 195 | |
| 196 | |
| 204 | 197 **Important:** You should always favor the :ref:`creation of a new |
| 198 plugin <creating-plugins>` over modifications to the internal code | |
| 199 (see below)! | |
| 200 | |
| 201 | |
| 199 | 202 |
| 203 Contributor License Agreement | |
| 204 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 205 | |
| 206 It is necessary for the Orthanc project to make sure that the internal | |
| 207 code of Orthanc can be interfaced with proprietary systems, as those | |
| 208 are still unfortunately everywhere in the healthcare market. This | |
| 209 forces us to require all the intellectual property over the source | |
| 210 code of Orthanc to be centralized, with the University Hospital of | |
| 211 Liège together with the Osimis company acting as the official | |
| 212 guardians of the whole Orthanc ecosystem. This centralization also | |
| 213 enables the dual licensing scheme described above, which in turn | |
| 214 allows Osimis to collect money from the industry in order to fund | |
| 215 further free and open-source development of the Orthanc ecosystem to | |
| 216 the benefit of the worldwide community of medical imaging, according | |
| 217 to a virtuous cycle. | |
| 218 | |
| 219 As a consequence, before any code can be accepted into the official | |
| 220 repositories of Orthanc, the individual code contributors must sign a | |
| 221 `Contributor License Agreement (CLA) | |
| 222 <https://en.wikipedia.org/wiki/Contributor_License_Agreement>`__. Here | |
| 223 is the procedure: | |
| 224 | |
| 225 1. Download the individual CLA (ICLA) form from the `Orthanc homepage | |
| 226 <https://www.orthanc-server.com/resources/2019-02-12-IndividualContributorLicenseAgreementOrthanc.pdf>`__. | |
| 227 | |
| 228 2. Print the document, then write down your signed initials on pages 1 | |
| 229 and 2, and sign page 3. | |
| 230 | |
| 231 3. Return a scanned copy of the document to e-mail ``orthanc-legal@osimis.io``. | |
| 232 | |
| 233 4. Wait for confirmation from the Osimis company. | |
| 234 | |
| 235 **Important:** This form is only valid for individual contributors | |
| 236 acting as physical persons. If your company wishes to become | |
| 202 | 237 contributor as a juridical person, please request a Corporate CLA at |
| 238 the same e-mail address: ``orthanc-legal@osimis.io``. | |
| 199 | 239 |
| 240 | |
| 361 | 241 .. _submitting_code: |
| 242 | |
| 199 | 243 Submitting code |
| 244 ^^^^^^^^^^^^^^^ | |
| 245 | |
| 246 Once the CLA onboarding process has succeeded, use `Mercurial | |
| 247 <https://en.wikipedia.org/wiki/Mercurial>`__ to fork the official | |
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248 repository of interest. All the repositories are centralized on our |
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249 `self-hosted Mercurial server <https://hg.orthanc-server.com/>`__. |
| 199 | 250 |
| 361 | 251 A :ref:`dedicated page <repositories>` explains how to submit |
| 252 :ref:`simple patches <hg-patch>` or :ref:`full branches <hg-bundle>`. | |
| 199 | 253 |
| 254 **Some words of warning:** | |
| 255 | |
| 256 * Please stick to the :ref:`coding style <coding-style>` of Orthanc. | |
| 257 | |
| 258 * It is your responsibility to make sure that you have the | |
| 259 intellectual property over all the source code you commit into | |
| 260 Orthanc. | |
| 261 | |
| 262 * All the contributions will be carefully reviewed. Some contributions | |
| 263 may be modified, yet even rejected. A rejection might for instance | |
| 264 occur if your contribution does not match the Orthanc roadmap, does | |
| 265 not meet our high-quality code standards, or breaks backward | |
| 200 | 266 compatibility. Please be sure that we warmly welcome and appreciate |
| 267 your contributions, but be aware of the fact that we are quite | |
| 204 | 268 strict, and that the review process might take time. This is why the |
| 269 recommended way of contributing to Orthanc is always by | |
| 270 :ref:`creating contributed plugins <creating-plugins>`. | |
| 271 | |
| 272 * Your pull requests should be kept **as small as possible**, and | |
| 273 should be focused on one very specific issue or feature. Large | |
| 274 architectural changes are reserved for the core development team of | |
| 275 Orthanc, as we must follow our `long-term roadmap | |
| 360 | 276 <https://hg.orthanc-server.com/orthanc/file/default/TODO>`__. |
| 204 | 277 |
| 278 * Unit testing is mandatory. Integration tests should be submitted to | |
| 279 the `dedicated repository | |
| 449 | 280 <https://hg.orthanc-server.com/orthanc-tests/file/default>`__. |
| 199 | 281 |
| 282 * In the case of a doubt wrt. a potential contribution, please discuss | |
| 283 it on the `Orthanc Users | |
| 284 <https://groups.google.com/forum/#!forum/orthanc-users>`__ | |
| 285 discussion group before starting the actual development. |