SHA-256(plaintext) → HMAC → stored_hash
AES-256-GCM
PBKDF2 · 600,000 iterations Security
Encryption
June 15, 2026
8 min read
Zero-Knowledge Encryption in Practice: How PermitCore Keeps Your License Keys Secret
What does "zero-knowledge" actually mean in a license management context? We explain the full cryptographic chain — PBKDF2 key derivation, AES-256-GCM encryption, HMAC-SHA256 validation — and why a stolen database can never expose your license keys, even though validation itself passes through the server transiently.
ISV
SDK
Store
Email
API Strategy
Licensing
June 8, 2026
6 min read
License Key Distribution: The 5 Models Every Software Vendor Should Know
Perpetual, subscription, floating, node-locked, metered — each model solves a different problem and creates different support headaches. A practical guide to choosing the right model for your product and your customers.
dotnet add package PermitCore.SDK
// validate a license key
var
result =
await
client
.ValidateAsync(key);
// result.Valid == true ✓ Tutorial
.NET
June 1, 2026
12 min read
Integrate PermitCore with Your .NET Application in 15 Minutes
A step-by-step tutorial: install the SDK, configure the client, validate and activate license keys in C#, handle offline grace periods, and protect your application against key sharing — all with production-ready code.