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Open Digital Rights Enforcement Framework python implementation

Project description

ODRE Framework

License

This is a pythom impementation of the ODRE approach to enforce ODRL policices. You can play with this implementation in our demo.

Quickstart

Install

pip install pyodre

Enforce ODRL policies

from pyodre.odre import ODRE

policy = """
{
    "@context": "http://www.w3.org/ns/odrl.jsonld",
    "@type": "Offer",
    "uid": "http://example.com/policy:6163",
    "profile": "http://example.com/odrl:profile:10",
    "permission": [{
       "target": "http://example.com/document:1234",
       "assigner": "http://example.com/org:616",
       "action": "distribute",
       "constraint": [{
           "leftOperand": "dateTime",
           "operator": "lt",
           "rightOperand":  { "@value": "2025-01-01", "@type": "xsd:date" }
       }]
   }]
}
"""
usage_decision = ODRE().enforce(policy)
print(usage_decision)

In the case a user wants to activate the DEBUG mode that shows the interpretable policies, the actions and the usage decision the following excerpt must be used. In addition, note that the interpreter can be modified

usage_decision = ODRE().set_debug(True).set_interpreter(PythonInterpreter()).enforce(policy)
print(usage_decision)

Register new functions (descriptive + interpretable)

In order to include new operators or operands a user must provide the name space and a function prefix for the terms in the ontology extensions that is been integrated in ODRE. To do this, the user must include this information in the Interpreter class; for instance, a new function namespace prefix fnc: <http://organiation.org/namespace> and its function prefix fnc_. Then, the user must implement the function fnc_XX in the file python functions considering that XX should meet the term in the ontology, for instance the python function fnc_time will be called if the policy contains the term fnc:time.

Interpolation

The policy templating is based on the Jinja language, it can be used to pass data variables that are not hardcoded in the policy increasing its privacy or it can be used to pass python native functions so they can be expressed in the policy and invoked during the enforcement.

In the following example a variable {{token}} is expressed in the policy and, as left operand, the function {{retrieve_token()}} is used. Note that the value of both is passed to the ODRE object under the parameter interpolations

policy = """
{
    "@context": "http://www.w3.org/ns/odrl.jsonld",
    "@type": "Offer",
    "uid": "http://example.com/policy:6163",
    "profile": "http://example.com/odrl:profile:10",
    "permission": [{
       "target": "http://example.com/document:1234",
       "assigner": "http://example.com/org:616",
       "action": "distribute",
       "constraint": [{
           "leftOperand": "dateTime",
           "operator": "lt",
           "rightOperand":  { "@value": "2025-01-01", "@type": "xsd:date" }
       },{
           "leftOperand": { "@value": "{{retrieve_token()}}" , "@type": "xsd:string" },
           "operator": "eq",
           "rightOperand":  { "@value": "{{token}}", "@type": "xsd:string" }
       }]
   }]
}
"""

def get_token():
    return "AAA"

usage_decision = ODRE().set_debug(True).enforce(policy, interpolations={'token' : 'AAA', 'retrieve_token' : get_token})
print(usage_decision)

Supported features

ODRL operantors

Operators Implementation status #
eq supported
gt supported
gteq supported
lt supported
lteq supported
neq supported
hasPart unsupported
isA unsupported
isAllOf unsupported
isAnyOf unsupported
isNoneOf unsupported
isPartOf unsupported

ODRL operands

Left Operands Implementation status #
absolutePosition unsupported
absoluteSize unsupported
absoluteSpatialPosition unsupported
absoluteTemporalPosition unsupported
count unsupported
dateTime supported
delayPeriod unsupported
deliveryChannel unsupported
device unsupported
elapsedTime unsupported
event unsupported
fileFormat unsupported
industry unsupported
language unsupported
media unsupported
meteredTime unsupported
payAmount unsupported
percentage unsupported
product unsupported
purpose unsupported
recipient unsupported
relativePosition unsupported
relativeSize unsupported
relativeSpatialPosition unsupported
relativeTemporalPosition unsupported
resolution unsupported
spatial unsupported
spatialCoordinates unsupported
system unsupported
systemDevice unsupported
timeInterval unsupported
unitOfCount unsupported
version unsupported
virtualLocation unsupported
Right Operands Implementation status #
policyUsage unsupported

ODRL actions

Actions Implementation status #
policyUsage unsupported

BibTeX Citation

@misc{cimmino2024opendigitalrightsenforcement,
      title={Open Digital Rights Enforcement Framework (ODRE): from descriptive to enforceable policies}, 
      author={Andrea Cimmino and Juan Cano-Benito and Raúl García-Castro},
      year={2024},
      eprint={2409.17602},
      archivePrefix={arXiv},
      primaryClass={cs.CR},
      url={https://arxiv.org/abs/2409.17602}, 
}

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