Introduction

When you've built a trusted software brand like Notepad++, seeing an unauthorized version appear on another platform can be alarming. In early 2025, Notepad++ creator Don Ho discovered a macOS app using the same name and trademark without permission. Instead of a legal battle, he publicly called out the violation, leading to a cooperative rebranding. This guide walks you through the exact steps he took—and how you can protect your own software trademark from unauthorized ports. Whether you're an indie developer or a team lead, following these steps can save you time, reputation, and legal headaches.

What You Need

• Proof of trademark registration (or common-law evidence of use)
• Contact information for the infringing developer (website, app store listing, social media, email)
• Legal counsel (optional but recommended for serious cases)
• A public communication channel (blog, Twitter, website banner)
• A cooperative mindset—negotiation often works better than litigation

Step-by-Step Guide

Step 1: Identify the Unauthorized Use

Start by searching app stores and websites for copies of your software. In Ho's case, he found a macOS app called "Notepad++" that claimed to be the official version for Mac. Check the developer name, contact info, and app description. Document everything: screenshots, URLs, and timestamps. This evidence will be crucial if you need to escalate.

Pro tip: Set up Google Alerts for your app name + "app" or "download" to catch unauthorized versions early.

Step 2: Issue a Public Statement

Before contacting the infringer, clarify your position publicly. Ho wrote a blog post stating the macOS app was "not authorized, not endorsed, and not affiliated" with the real Notepad++. This serves two purposes: it warns your users and establishes your trademark stance legally. Use clear language—say "fake" or "unauthorized"—but avoid threats. Politeness is power.

Step 3: Contact the Developer Directly

Reach out privately to the person behind the unauthorized app. Ho’s team contacted Andrey Letov, the developer of the macOS port. Keep the tone professional but firm. Explain that the trademark is yours, and ask for a rebrand or removal. Provide a deadline. In many cases, developers don’t realize they’re infringing—they just see an opportunity.

Sample email opener: “I’m the creator of [Your App]. I noticed your version uses the same name. While I appreciate the effort, I need to protect my trademark. Let’s discuss a solution.”

Step 4: Negotiate a Rebranding Plan

If the developer is cooperative, work out a transition. Letov agreed to rebrand with a new logo, a refined name, and a new domain—all shipped in version 1.0.6. Ensure the plan includes: a new name that doesn’t imply affiliation, a notice to existing users, and a phase-out of old branding. Set a timeline (e.g., “within two weeks”).

Ho allowed the app to continue existing but with clear separation. This is often the best outcome: the app lives, you protect your mark, and users aren’t stranded.

Step 5: Monitor Compliance and Follow Up

After the rebrand, check the app store and website monthly. Ho stated that the macOS app remains “unofficial” and is now properly branded. If the developer fails to deliver, escalate to the app store (Apple, Google) with your trademark registration. Many platforms have takedown procedures for infringing apps.

Pro tip: Keep a record of all communications—they may be needed later.

Tips for Success

• Stay calm. Emotional reactions can escalate conflicts. A measured approach works better.
• Know your rights. Trademark law varies by country. Consult a lawyer if your app is widely known.
• Embrace community ports. If the port adds value, let it exist—but only with proper attribution and branding.
• Update your website. Add a page listing official sources to reduce confusion.
• Thank the developer publicly. If they cooperate, acknowledge their willingness to fix the issue. It builds goodwill.

Remember: Not every unauthorized version is malicious. By following these steps, you can turn a potential threat into a positive collaboration—just like Don Ho did.