MT4 vs MT5 Licensing: What's Different
Same business goal — different compilers, file formats, and deployment details. Here is what changes between platforms.
Shared licensing concepts
Whether your customers run MetaTrader 4 or 5, **EA license management** follows the same model: compile, protect, distribute, activate, validate. Keys encode entitlement — which product, how many activations, expiry, optional broker restrictions. The EA checks entitlement before trading.
Where **MT4 vs MT5 licensing** diverges is implementation detail inside MQL4 and MQL5, not the business rules you sell against.
File formats and compilation
MT4 produces `.ex4` from MQL4 source; MT5 produces `.ex5` from MQL5. Protection tools wrap different binaries, and **MQL4 licensing** integrations often assume no standard library split, while **MQL5 licensing** must account for includes, classes, and sometimes separate DLLs.
If you ship both platforms, you typically maintain two protected builds tied to one logical product SKU. A single **MetaTrader license key** can activate either build up to shared **EA activation limits**, or you can issue platform-specific keys — a commercial choice, not a technical requirement.
Runtime and validation hooks
MT4 EAs rely on `init()`, `start()`, and `OnTick` equivalents with WebRequest or DLL calls for online checks. MT5 uses `OnInit`, event handlers, and stricter trade context rules. License checks usually live in `OnInit` (MT5) or `init()` (MT4) with periodic re-validation on timer or new day.
MT5's stronger typing and multi-symbol architecture mean license modules are often packaged as include files shared across products. MT4 projects may inline validation for simplicity. Both approaches work if the protected outer binary is bound correctly.
Account and broker metadata
Both platforms expose account number and broker company name to running EAs — the foundation of broker locks and seat limits. MT5 adds richer account properties (hedging vs netting, exchange symbols) that you might use for advanced rules but rarely for basic retail licensing.
When setting **EA activation limits**, MT4 users often run one EA per chart on fewer charts; MT5 users may run the same EA on multiple symbols from one chart attachment. Document whether one activation means one account globally or one account per terminal instance to avoid support confusion.
Distribution and updates
MT4 remains common at retail brokers; MT5 grows with multi-asset and hedging workflows. Many developers still sell MT4-first and add MT5 as a tier upgrade. Your licensing backend should track which build a customer downloaded so support can say "re-download the MT5 build from your order email" without guessing.
Marketplace listings can expose both files under one product. See the marketplace for how verified sellers deliver dual-platform SKUs with escrow-backed file access.
Protection tooling differences
**MQL4 licensing** tools must handle older terminal builds still deployed at legacy brokers. **MQL5 licensing** tools should track MetaEditor compiler updates that affect bytecode. Test protected builds on the oldest terminal version you officially support.
Build binding applies to both; revocation and key expiry behave identically on the server side. Platform-specific differences sit in the client stub inside each binary.
Choosing a unified vs split strategy
| Approach | Best for |
| --- | --- |
| One key, two builds | Retail products where buyers pick their platform |
| Separate SKUs | When MT5 build required substantially more dev time |
| MT5-only | New products targeting brokers that deprecated MT4 |
Unified keys reduce support load. Split SKUs maximize revenue from platform-specific value. Either way, configure limits in one admin panel — see pricing for per-product license quotas.
Migration from MT4 to MT5
If you sunset MT4, grandfather existing keys with an expiry date and offer MT5 re-activation at no charge. Communicate build binding rotation so cracked MT4 files do not carry over credibility into your MT5 line.
Licensing is the contract layer between you and the customer; platform changes are just new delivery artifacts under that contract.
FAQ
FAQ
Quick answers related to this guide.
Can one license key work on both MT4 and MT5?
Yes, if your product includes both protected builds and your licensing backend maps one entitlement to both file types. Many developers use one key with two downloads.
Is MT5 licensing more secure than MT4?
MT5 tooling is newer, but security depends on your protection and build binding vendor — not the platform alone. Both need proper anti-piracy, not just compiler defaults.
Do activation limits count differently on MT5 multi-symbol setups?
Limits should be defined by account (or machine), not by chart count. Document this clearly so customers know one live account equals one activation regardless of symbols traded.
Should I maintain MT4 licensing for new products in 2026?
If your buyers still execute on MT4 at target brokers, yes. Let sales data drive the split, but protect both builds if you ship both.
Ready to protect your Expert Advisors? Compare EA licensing pricing or browse the MT4/MT5 marketplace.