Build vs Buy: Developing Your Own Software Licensing Service
Writing a basic license check, say a key with an expiry date, takes an afternoon. The trouble starts later. Sooner or later you need trials, subscriptions with renewals, upgrades, device limits, concurrent users, refunds, a checkout with payment and tax handling, a page where customers can see their licenses, reports, and support for customers who are offline. At that point you’re building and running a second product, and you’ll be maintaining it for as long as you sell the first one.
Our rule of thumb: build it yourself if licensing is simple and won’t change, or if it’s part of what makes your product special. Use a Licensing-as-a-Service such as Labs64 NetLicensing if you need several licensing models, expect your pricing to change, or would simply rather spend your engineering time on your own product.
What a licensing system has to do
| Area | What you’d build and run |
|---|---|
| Data model | Products, editions or modules, license types, prices, customers, licenses, transactions |
| Licensing rules | Trials, subscriptions with renewals and grace periods, feature sets, device binding, concurrent sessions, usage counters, quotas |
| Validation service | An API that’s always up, with authentication, caching rules and failover |
| Tamper resistance | Signed responses, key management, defence against fake license servers and edited local caches |
| Offline support | Cached or signed results with an expiry, or an on-premises server for isolated networks |
| Commerce | Checkout, payment providers, recurring payments, promo codes, invoices, VAT and sales tax |
| Customer self-service | Pages to buy, upgrade, renew and view licenses |
| Operations | Admin console, an automation API, webhooks to CRM and ERP, usage and expiry reports |
| Compliance | Personal data handling (GDPR, for example), audit trail, data export and deletion |
The work that comes after version 1
Pricing changes are the big one. Moving from perpetual licenses to subscriptions, or adding a free plan or usage-based pricing, touches the rules engine, the shop and the reports all at once.
Then there’s uptime. If your license server goes down, paying customers can get locked out, so you need monitoring, redundancy and someone on call. The signing keys have to be protected and rotated, dependencies patched, and the validation endpoint will attract attackers. Payment provider APIs change, and so do tax rules (EU VAT for digital services is a good example). And customers will keep losing keys, replacing hardware and asking for licenses to be moved to another account.
When you compare costs, count all of this over the whole life of the product, not only the first build.
When building your own makes sense
- You have one licensing model and it won’t change, for example a perpetual license key with no online part.
- The licensing logic is part of your product’s value, or it depends on data you can’t share.
- Regulations or contracts rule out any external service, and an on-premises component isn’t an option either.
- You already run the commerce, billing and entitlement systems that licensing would plug into.
When a licensing service makes sense
- You need more than one licensing model, or you want to try new pricing without changing code.
- Some of your customers are online and some aren’t.
- You want customers to buy and renew without anyone on your team lifting a finger.
- Your team is small, or licensing just isn’t where you want to spend engineering time.
Questions to ask any licensing service
Ask these about NetLicensing too:
- Which licensing models are built in, and can you combine them in one product?
- What happens in your application when the service is unreachable? Is there a TTL, a backup host, an offline mode?
- How are validation responses protected against forgery?
- Are there SDKs for your languages, and is the API described in a machine-readable spec?
- Can you sell through your own shop or payment provider, or only through theirs?
- How is personal data handled, and where is the provider based?
- What will it cost at your expected number of customers and validations, and which features depend on the plan?
- How do you get your data out if you leave?
How NetLicensing covers each area
| Area | NetLicensing |
|---|---|
| Data model | Object model: product, product module, license template, licensee, license, transaction, bundle |
| Licensing rules | Licensing models: Try & Buy, Subscription, Pricing Table, Multi-Feature, Floating, Node-Locked, Pay-per-Use, Quota, Rental, Discount |
| Validation service | Validate API with TTL, a backup host, API keys with roles |
| Tamper resistance | Signed validation responses |
| Offline support | TTL caching, signed offline validation files, the NetLicensing Agent (selected plans); see Offline License Validation |
| Commerce | NetLicensing Shop with PayPal and Stripe, EU VAT and discounts, or your own shop via NetLicensing Gateway (FastSpring, MyCommerce and others) |
| Customer self-service | Customer Portal |
| Operations | Management Console, REST API, notifications, warning levels, reporting, and an MCP server for AI agents |
| Compliance | Privacy Center and a Data Processing Agreement; Labs64 GmbH is based in Munich, Germany |
Three things stay with you: generating machine fingerprints and session IDs (guidance), acting on the result inside your application (and protecting your binary against tampering), and storing the cached validation result on the client.
If you’d like to try it, register a free vendor account and follow Getting Started.