License Verification Guide

Learn how to implement secure license verification in your application with best practices and examples.

Overview

License verification is the process of validating that a user has a valid license to use your software. This guide covers everything you need to know to implement secure, reliable license verification.

What You'll Learn

Implementation

Basic license verification setup
Online vs offline verification
Error handling and retry logic
Performance optimization

Security

Server-side verification
Client-side security measures
Anti-tampering techniques
Rate limiting and abuse prevention

Basic Implementation

1. Install the SDK

Start by installing the LicenseChain SDK for your preferred programming language.

# JavaScript/TypeScript
npm install @licensechain/sdk

# Python
pip install licensechain

# PHP
composer require licensechain/sdk

2. Initialize the Client

Set up the LicenseChain client with your API credentials.

// Import LicenseChain SDK
// Initialize client with API credentials
// Ready to verify licenses

3. Verify a License

Implement basic license verification with proper error handling.

// Verify license function
// Check if license is valid
// Handle success and error cases
// Return verification result

Security Best Practices

Server-Side Verification

Always verify licenses on your server, not just the client
Use HTTPS for all API communications
Implement proper authentication and authorization
Log all verification attempts for auditing
Use rate limiting to prevent abuse

Client-Side Security

Obfuscate license verification code
Use code signing to prevent tampering
Implement anti-debugging measures
Validate license data integrity
Use secure storage for cached license data

Anti-Tampering

Use device fingerprinting to prevent license sharing
Implement hardware-based licensing when possible
Monitor for suspicious usage patterns
Use encrypted communication channels
Implement license revocation mechanisms