id: 231 slug: vr-app-anti-piracy-mechanism-implementation title_en: "Implementation of Anti-Piracy Mechanisms in VR Applications" tags: [vr-ar]
Implementation of Anti-Piracy Mechanisms in VR Applications
Quest APK extracted from device in minutes: adb backup or direct copy from /sdcard/Android/obb/. After this, .apk uploaded to forums and installed via sideload without any purchases. For paid VR-apps and licensed corporate trainers this is direct loss. The question is not if they will crack it — but how expensive to make it.
Protection Levels and Where They Actually Work
License verification via platform API — first and most important level. For Oculus/Meta Store — Entitlement Check via Oculus.Platform.Entitlements.IsUserEntitledToApplication(). This is async request to Meta-servers at startup: if account didn't buy app — OnNotEntitled callback, application terminates. Works reliably for official store apps, useless for sideloaded APK.
For SteamVR — ISteamApps.BkInitCallback() + SteamManager with SteamApps.BIsAppInstalled(AppID) check. Similarly: works only with Steam client and license present.
For corporate apps distributed outside stores, platform API unavailable — need custom licensing system.
Custom activation built on several principles:
- License key bound to
SystemInfo.deviceUniqueIdentifier(on Android — ANDROID_ID) + hardware fingerprint - Key verified on server at first launch and periodically (every 24–72 hours)
- Server maintains list of activated devices with activation limit per key
- On license revocation (employee termination, expired contract) next check gives block
Offline vulnerability: if app works without internet (standalone trainer), need grace period — say 7 days without server check. Longer — risk of operation with revoked license.
Code obfuscation via Unity obfuscators (Obfuscar, BeeByte Obfuscator for Unity) renames classes and methods in IL2CPP-assembly. Not full reverse-protection — il2cppdumper recovers structure — but substantially complicates patching specific license check.
Critical: don't store secrets in client code. License server must be authority — client shouldn't contain logic "if flag X = true, consider activated". Any such flag findable via Memory Editor (GameGuardian) and toggled.
Additional Measures for Corporate VR
For trainers where content is confidential:
Asset encryption. AssetBundle with AES-256 encryption: key not stored in APK, requested from server after successful authorization. Without key — encrypted blob useless.
Integrity Check. On startup compute hash of critical assemblies (Application.dataPath) and compare with server reference. Modified APK gives mismatch. Implemented via System.Security.Cryptography.SHA256.
Runtime Tamper Detection. Check Debug.isDebugBuild, Application.isEditor, root presence via Android JNI (/system/app/Superuser.apk). On detection — session termination or functionality limitation.
From practice: in corporate VR-trainer for industrial enterprise, required guarantee that content never leaves device. Additionally to asset encryption implemented screenshot prevention via Android FLAG_SECURE (WindowManager.LayoutParams.FLAG_SECURE via JNI) — system screenshot and screen recording show black screen.
Work Stages
Threat analysis. Determine what really needs protection: casual sideload, targeted cracking, confidential content leak, unauthorized license use.
Protection level selection. For each threat — appropriate mechanism. Don't implement redundant protection where platform Entitlement Check suffices.
Development. License server (if needed), client integration, asset encryption, integrity checks.
Testing. Verify all bypass scenarios: internet disabled, unlicensed account, attempt to run on unactivated device.
| Protection Level | Estimated Timeline |
|---|---|
| Platform Entitlement Check (Meta/Steam) | 2–4 days |
| Custom licensing system with server | 2–4 weeks |
| Asset encryption + integrity + tamper detection | 4–8 weeks |
Cost calculated after security requirements and app distribution type analysis.