Python License Checker
Check python packages listed in a
requirements.txt file and report license issues.
You can define a list of authorized licenses, unauthorized licenses and authorized packages.
The tool will check the
requirements.txt file, check packages and their
dependencies and return an error if some packages are not compliant
against the given strategy.
The tool has 3 levels of checks to select from:
- Standard (default):
- A package is considered as compliant when at least one of its licenses is in the authorized license list, or if the package is in the list of authorized packages.
- Same as Standard, but a package is not considered compliant when one or more of its licenses is in the unauthorized license list, even if it also has a license in the authorized license list. A package is still compliant if present in the authorized packages list.
- All licenses listed for a package must be in the authorised license list for the package to be considered compliant. A package is still compliant if present in the authorized packages list.
How to install
$ pip install liccheck
How to use
liccheck will read the
requirements.txt and verify compliance of packages against a strategy defined in the
If the file is not specified on command line, it will search for
requirements.txt in the current folder.
You have to setup an
ini file with an authorized license list, unauthorized license list and authorized package list.
Here is an example of a
# Authorized and unauthorized licenses in LOWER CASE [Licenses] authorized_licenses: bsd new bsd bsd license new bsd license simplified bsd apache apache 2.0 apache software license gnu lgpl lgpl with exceptions or zpl isc license isc license (iscl) mit mit license python software foundation license zpl 2.1 unauthorized_licenses: gpl v3 [Authorized Packages] # Python software license (see http://zesty.ca/python/uuid.README.txt) uuid: 1.30
For demo purpose, let's say your
requirements.txt file contains this:
Flask>=0.12.1 flask_restful jsonify psycopg2>=2.7.1 nose scipy scikit-learn pandas numpy argparse uuid sqlbuilder proboscis pyyaml>=3.12
The execution will output this:
$ liccheck -s my_strategy.ini -r my_project/required.txt gathering licenses...23 packages and dependencies. check forbidden packages based on licenses...none check authorized packages based on licenses...19 packages. check authorized packages...4 packages. check unknown licenses...none
If some dependencies are unknown or are not matching the strategy, the output will be something like:
$ liccheck -s my_strategy.ini -r my_project/requirements.txt gathering licenses...32 packages and dependencies. check forbidden packages based on licenses...1 forbidden packages : Unidecode (0.4.21) : GPL ['GNU General Public License v2 or later (GPLv2+)'] dependencye(s): Unidecode << python-slugify << yoyo-migrations check authorized packages based on licenses...24 packages. check authorized packages...6 packages. check unknown licenses...1 unknown packages : feedparser (5.2.1) : UNKNOWN  dependencye(s): feedparser
- See LICENSE