Python License Checker

Check python packages listed in a requirements.txt file and report license issues.

About

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.

Cautious:

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.

Paranoid:

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 ini file. 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 strategy.ini file:

# 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

Note: versions of authorized packages can be defined using PEP-0440 version specifiers, such as >=1.3,<1.4. The implementation uses the nice package semantic_version.

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+)']
          dependency:
              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 []
          dependency:
              feedparser

Licensing

• See LICENSE