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Privacy Policy for Zento Reader

Product: Zento Reader: Smart TOC & Dark Theme (Chrome Extension) • Effective Date: September 23, 2026

Welcome to Zento Reader, operated by ZentoMedia Ecosystem (“we”, “our”, or “us”). We are dedicated to providing an ergonomic, eye-care reading companion while maintaining strict user privacy. This Privacy Policy details our data handling practices in full compliance with the Google Chrome Web Store User Data Policy and the Google API Services User Data Policy (Limited Use requirements).

1. Core Principles: 100% Privacy-First & Local Processing

  • Zero Browsing History Collection: Zento Reader does NOT record, track, transmit, or sell your browsing history, page URLs, search queries, or the text content of the articles you read.
  • Client-Side Execution: All contrast evaluations (WCAG 2.1 AAA 15:1), dark/sepia/OLED stylesheet injections, and floating Table of Contents (Smart TOC) extractions are executed locally within your browser sandbox.
  • No Remote Code: The extension contains no remote scripts, no eval(), and no dynamic external CDN script loaders, adhering strictly to Chrome Manifest V3 specifications.

2. Permissions Justification & Usage Declarations

To deliver its core accessibility, contrast healing, and reading navigation features, Zento Reader requests the following specific browser permissions:

  • activeTab: Allows the extension to apply user-selected eye-care stylesheets and outline navigation to the active tab upon explicit user interaction (e.g. clicking the popup or pressing keyboard shortcuts).
  • scripting: Required to inject sanitized, CSP-compliant CSS stylesheets and optical contrast adjustments directly into document frames at document_start to eliminate blinding white flashes.
  • storage: Enables chrome.storage.local and chrome.storage.sync to locally save your visual preferences (chosen theme, image brightness level, custom URL pattern rules, daily TOC reading counter, and license activation status).
  • identity: An auxiliary permission used strictly to query the signed-in Google account email address to simplify Pro license activation for paying customers. We do not share, transmit, or use this email address for advertising, tracking, or marketing.
  • alarms: Schedules a lightweight, non-tracking background task (once every 24 hours) to fetch the public denylist of revoked/refunded license keys from our official CDN.
  • <all_urls> (Host Permissions): Allows readers to apply eye comfort themes and generate floating Smart TOC navigation across any web page or domain of their choice.

3. Payment Processing & Financial Information

Upgrades to Zento Reader Pro are processed through industry-standard, PCI-DSS compliant payment gateways (such as Stripe or ExtensionPay).ZentoMedia does not collect, process, or store credit card numbers, banking details, or billing addresses. All financial transactions are encrypted and handled directly by the payment processor.

4. Google Limited Use Compliance Disclosure

Zento Reader strictly adheres to the Chrome Web Store User Data Policy, including the Limited Use requirements:

  1. We only use permissions and data to provide or improve user-facing features that are prominent in the Extension's single-purpose user interface.
  2. We do NOT transfer, sell, or license user data to third parties, data brokers, or advertising networks.
  3. We do NOT use or transfer user data for serving personalized, re-targeted, or interest-based advertisements.
  4. We do NOT use user data for creditworthiness determinations or lending purposes.

5. Data Retention & User Control

All settings and custom URL rules remain under your total control in your local browser storage. You can reset or erase all saved preferences at any time by navigating to the extension's Options page and clicking “Reset to Defaults”, or by uninstalling the extension from Chrome.

6. Contact & Support

For questions regarding this Privacy Policy or your data privacy rights, please contact our engineering team: