Last Updated: May 31, 2026 

Privacy Policy

Last Updated: May 31, 2026

Lockzen ("we", "our", or "the App") is an Android application that provides app locking and privacy vault functionality. This Privacy Policy explains how information is handled when you use the App.

Privacy-First by Design

Lockzen is built with privacy as a core principle. We do not collect, transmit, store, or sell personal information on external servers. All sensitive data remains exclusively on your device and under your control.

1. Information We Do Not Collect

Lockzen does not collect or process any of the following:

• Personal information such as your name, email address, or phone number

• User accounts or registration data

• Photos, videos, or files stored in the vault

• Location information (GPS or network-based)

• Contacts, call logs, or messages

• PINs, biometric data, or authentication credentials

• Analytics, behavioral tracking, or advertising profiles

• Any data for sale or sharing with third parties

2. Information Stored Locally on Your Device

To provide its core functionality, Lockzen stores certain information locally on your device only.

Data

Purpose

Storage Location

PIN Hash (PBKDF2)

Authenticate access to the App

Encrypted DataStore

Locked App List

Identify protected applications

Room Database

Vault Files

Store encrypted photos and videos

App-private Internal Storage

Intruder Photos

Capture unauthorized access attempts

App-private Internal Storage

Intrusion Logs

Record failed authentication attempts

Room Database

Recovery Code Hash

Emergency PIN recovery

Encrypted DataStore

Preferences & Settings

Theme, language, security settings

DataStore

PIN Security

Your PIN is never stored in plaintext.

Lockzen uses PBKDF2 with SHA-256 and 100,000 iterations to generate a one-way cryptographic hash. This design helps protect your PIN even if device storage is compromised.

3. Permissions and How They Are Used

Required Permissions

Permission

Purpose

Usage Access (PACKAGE_USAGE_STATS)

Detects which application is currently in the foreground so Lockzen can protect selected apps.

Display Over Other Apps (SYSTEM_ALERT_WINDOW)

Displays the lock screen overlay when a protected app is opened.

Foreground Service

Keeps the protection service running in the background as required by Android.

All usage data is processed locally on the device and is never transmitted externally.

Optional Permissions

Permission

Purpose

Camera

Enables the Intruder Selfie feature after multiple failed PIN attempts.

Notifications (POST_NOTIFICATIONS)

Displays service notifications and security alerts.

Device Administrator

Helps prevent unauthorized uninstallation when enabled by the user.

Vibration

Provides haptic feedback during PIN entry.

These permissions are optional and can be enabled or disabled by the user at any time.

Permissions We Never Request

Lockzen does not request access to:

• Location services

• Contacts

• Phone calls or call logs

• SMS or MMS messages

• Microphone

• Broad storage access permissions

The App uses Android's scoped storage and Storage Access Framework (SAF) where applicable.

4. Third-Party Services

Google AdMob

The free version of Lockzen may display advertisements through Google AdMob.

Google AdMob may collect information such as:

• Advertising ID

• Device information (device model, operating system version)

• Approximate location (country-level information derived from IP address)

This information is collected directly by Google and is governed by Google's own privacy practices.

Premium subscribers do not see advertisements.

Google Play Billing

Lockzen uses Google Play Billing for subscription purchases.

Payment processing and purchase information are handled by Google Play. Lockzen does not store credit card information, billing details, or payment credentials.

5. Security Measures

We implement industry-standard security practices to protect your data:

Encryption

Vault files are encrypted using AES-256-GCM encryption.

Encryption keys are stored in Android Keystore and may be hardware-backed on supported devices.

Authentication Protection

PIN credentials are protected using PBKDF2 with 100,000 iterations and SHA-256 hashing.

Local Storage Isolation

Sensitive information is stored in app-private directories that are inaccessible to other applications without elevated system privileges.

Minimal Network Usage

Lockzen operates primarily offline. No personal or vault data is transmitted over the internet. Network communication is limited to services provided by Google, such as advertising delivery and billing verification.

6. Children's Privacy

Lockzen is not intended for children under the age of 13.

We do not knowingly collect personal information from children. If you believe a child has provided personal information through the App, please contact us so we can address the concern appropriately.

7. Data Retention and Deletion

All information managed by Lockzen remains stored locally on your device.

You may delete data at any time, including:

• Intruder photos

• Intrusion logs

• Vault files

• Application settings

Uninstalling Lockzen permanently removes all locally stored data associated with the App.

8. Your Privacy Rights

Because Lockzen does not maintain user accounts or store personal data on external servers, all information remains under your direct control.

You may:

• Delete vault content at any time

• Remove intruder photos and logs

• Disable optional permissions

• Remove Device Administrator privileges

• Uninstall the App and permanently erase all associated data

9. QUERY_ALL_PACKAGES Permission

Lockzen uses the QUERY_ALL_PACKAGES permission to display a complete list of installed applications so users can choose which apps to protect.

This information:

• Is displayed only within the authenticated user interface

• Is never transmitted to external servers

• Is never shared with third parties

• Is used solely for app-lock functionality

The permission is essential to the core purpose of the App.

10. Changes to This Privacy Policy

We may update this Privacy Policy from time to time.

Any changes will be reflected by updating the "Last Updated" date at the top of this page. Continued use of the App after changes become effective constitutes acceptance of the revised Privacy Policy.

11. Contact Us

If you have questions regarding this Privacy Policy or Lockzen's privacy practices, please contact us:

Email: support@lockzen.app

Effective Date: May 31, 2026