How Can I Protect My Java Software from Piracy?

You’re right that this issue isn’t exclusive to Java; it’s a broader DRM problem. The most effective way to manage software piracy is to have some form of online validation or authentication. Many companies limit the use of their software to a single registered machine by requiring a user to log in. Although it can be frustrating for users, this method helps manage licenses more effectively. Look at how some games handle it, especially single-player titles; there's definitely insight there.

Many have found success by moving to a subscription model because it requires an internet connection, ensuring you can manage access effectively. Integrating a backend that handles login for your software can also help limit usage and instill a sense of value in legitimate purchases. Just keep the user experience in mind and strive for balance.

Consider using SaaS instead of a traditional software model, which simplifies licensing. If that's not feasible, advanced obfuscation tools like Zelix Klassmaster or Stringer can help protect your code, but remember that any determined pirate can still find ways around it. You could also implement a licensing system that creates a unique fingerprint of the user’s system, but this needs thorough planning to make sure it’s still user-friendly.

Honestly, creating a great product at a fair price goes a long way. Many people are willing to pay if they feel they’re getting value. Make the purchasing experience easy and consider offering both one-time and subscription payment models. Also, keep in mind that no anti-piracy measure is perfect; if you make it too hard, you risk alienating honest customers.

At the end of the day, whatever you choose to implement, remember that everything can be hacked. The focus should really be on making it easier for people to pay for your software than to obtain it illegally. Also, consider a hardware dongle for licensing if applicable; they add a layer of physical protection.