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- Copyright and licensing of the Python Cryptography Toolkit ("PyCrypto"):
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Previously, the copyright and/or licensing status of the Python
- Cryptography Toolkit ("PyCrypto") had been somewhat ambiguous. The
- original intention of Andrew M. Kuchling and other contributors has
- been to dedicate PyCrypto to the public domain, but that intention was
- not necessarily made clear in the original disclaimer (see
- LEGAL/copy/LICENSE.orig).
- Additionally, some files within PyCrypto had specified their own
- licenses that differed from the PyCrypto license itself. For example,
- the original RIPEMD.c module simply had a copyright statement and
- warranty disclaimer, without clearly specifying any license terms.
- (An updated version on the author's website came with a license that
- contained a GPL-incompatible advertising clause.)
- To rectify this situation for PyCrypto 2.1, the following steps have
- been taken:
- 1. Obtaining explicit permission from the original contributors to
- dedicate their contributions to the public domain if they have not
- already done so. (See the "LEGAL/copy/stmts" directory for
- contributors' statements.)
- 2. Replacing some modules with clearly-licensed code from other
- sources (e.g. the DES and DES3 modules were replaced with new ones
- based on Tom St. Denis's public-domain LibTomCrypt library.)
- 3. Replacing some modules with code written from scratch (e.g. the
- RIPEMD and Blowfish modules were re-implemented from their
- respective algorithm specifications without reference to the old
- implementations).
- 4. Removing some modules altogether without replacing them.
- To the best of our knowledge, with the exceptions noted below or
- within the files themselves, the files that constitute PyCrypto are in
- the public domain. Most are distributed with the following notice:
- The contents of this file are dedicated to the public domain. To
- the extent that dedication to the public domain is not available,
- everyone is granted a worldwide, perpetual, royalty-free,
- non-exclusive license to exercise all rights associated with the
- contents of this file for any purpose whatsoever.
- No rights are reserved.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- SOFTWARE.
- Exception:
- - Portions of HMAC.py and setup.py are derived from Python 2.2, and
- are therefore Copyright (c) 2001, 2002, 2003 Python Software
- Foundation (All Rights Reserved). They are licensed by the PSF
- under the terms of the Python 2.2 license. (See the file
- LEGAL/copy/LICENSE.python-2.2 for details.)
- EXPORT RESTRICTIONS:
- Note that the export or re-export of cryptographic software and/or
- source code may be subject to regulation in your jurisdiction.
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