Скачать или смотреть Implementing a Time-Limited Trial for Your Shareware Application

Discover essential strategies for creating a `time-limited trial` for your shareware application, including protection mechanisms and trial extension approaches.
---
This video is based on the question https://stackoverflow.com/q/197999/ asked by the user 'JimDaniel' ( https://stackoverflow.com/u/63/ ) and on the answer https://stackoverflow.com/a/198025/ provided by the user 'Brian R. Bondy' ( https://stackoverflow.com/u/3153/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, comments, revision history etc. For example, the original title of the Question was: Need Advice on Implementing a Time-limited Trial

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 2.5' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 2.5' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Implementing a Time-Limited Trial for Your Shareware Application

Creating a shareware desktop application is an exciting venture, and one crucial aspect of this process is implementing a time-limited trial. This is critical to allow users to evaluate your software before purchasing it. In this guide, we will explore effective strategies to set up a trial period that works well for you and your users while also addressing common concerns about protecting your application.

Understanding the Challenge

When developing a time-limited trial, it is important to recognize that users might attempt to bypass the trial limitations. These methods can range from simple tricks to more involved hacking attempts. The goal should not be to make it impossible to crack your trial period but rather to introduce enough resistance that most users will not find it worthwhile to try.

Key Considerations

Complexity vs. Usability: The protection mechanism should not be overly complicated or time-consuming for you to implement.

User Experience: You want the trial experience to be smooth for genuine users, encouraging them to eventually make a purchase.

Effective Strategies for Time-Limited Trials

Below are some practical methods you can implement in your application to track the trial period effectively:

1. Utilize Registry for Tracking Usage

Implement Tick Count: Store a tick count in the system registry that increments with each unique day the application is used. For example, if the tick count exceeds 30, display an expired message to the user.

Uniqueness: Ensure that the count only increases with unique installations.

2. Track Installation Date

Install Date Logic: Capture and store the install date, ensuring to check against this whenever the software is launched. Be mindful of users who may alter their system dates; implement checks to counter this.

Validity Checks: If stock usage is overridden, prompt an expiration alert based on your predetermined trial length.

3. Handle Uninstallations Thoughtfully

Uninstall Procedures: Make sure that your uninstall process removes not just the application but also resets any tracked usage or 'days running' counts. This ensures that users who re-evaluate your product at a later date have the opportunity to do so without unfair advantages.

Extension of Trial Periods

In certain cases, users might express a desire for an extended trial period. Here’s a streamlined approach to manage those requests efficiently:

Automated Responses: When a user requests an extension, send an automated email containing a program called TrialExtend.exe along with a trial extension code.

Validation Process: This program should connect to your server with the presented code for validation. If it passes your checks, the user’s trial period is reset, offering them an extended opportunity to evaluate your software.

Conclusion

Implementing a time-limited trial for your shareware application doesn't have to be daunting. By employing effective strategies that balance protection with user experience, you can create a trial process that serves both you and your potential customers well. Remember, the main goal is to make it sufficiently challenging for unauthorized users while retaining a positive experience for legitimate users. With these tips, you’re on your way to building a robust trial system that enhances your software’s appeal and competitiveness.