#!/usr/bin/env python3
"""
Validating Training Data Authenticity

Source: Chapter_13_Data_Provenance_and_Supply_Chain_Security
Category: supply_chain
"""

import argparse
import sys

def verify_data_sources(data_manifest):
    """Check that training data comes from expected sources"""

    issues = []

    for data_item in data_manifest:
        # Check source URL is legitimate
        if not is_trusted_source(data_item['source_url']):
            issues.append(f"Untrusted source: {data_item['source_url']}")

        # Verify data checksum
        actual_hash = compute_hash(data_item['file_path'])
        if actual_hash != data_item['expected_hash']:
            issues.append(f"Data integrity violation: {data_item['file_path']}")

        # Check license compliance
        if not is_license_compatible(data_item['license']):
            issues.append(f"License issue: {data_item['license']}")

    return issues


def main():
    """Command-line interface."""
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--verbose", "-v", action="store_true", help="Verbose output")
    args = parser.parse_args()
    
    # TODO: Add main execution logic
    pass

if __name__ == "__main__":
    main()