How to Make My Product as a Trial Version for 30 Days

How can I make my product as a trial version for 30 days?

You could have another registry key that you increment after every day's use. That way, even if they change the computer's date, this key would indicate to your program that it's been running for > 30 days.

Additionally, this value could be encrypted so that if the user tries to manually change it, the program can refuse to run because it was unable to decrypt the value and get a valid number out of it.

To get around reinstalls, you could add some information to any file saved with the trial version of your app which is unique to that specific version of the app (perhaps a timestamp from when it was installed). When a trial version of your app tries to open a file, it will check this signature and ensure that it was created with that same instance, otherwise refuse to open the file. This essentially neuters the ability to simply reinstall the app and continue using it.

At the end of the day though, the user has complete control over their machine and can probably find a way around whatever it is you want to do (short of accessing a web service where these details are kept before you let the user use the app). You probably shouldn't expend so much energy trying to stop the guys who are willing to go through this extra trouble, but instead spend that extra time/money/energy improving the app for those who are willing to pay.

Create 30 day Trial Version

There is no way, which is one hundred percent reliable. You can query online website for current date, and users will reverse the requests with network sniffer and spoof the server. You can compare most recent temporary file date to detect clock rewinding, but it might cause other issues. You can do something else, and users will patch your code to remove the protection.

Do it the way that makes sense to you, still without having an obsession around it. Your code will stay hackable anyway. You will be better of reasonably pricing it so that hacking makes no sense.

Implementing a 30 day time trial

This issue comes up repeatedly on the cocoa-dev mailing list and the consensus answer is always do the simplest thing possible. Determined hackers will break all but the most over-engineered solution. And they're unlikely to pay for the software anyways. Go for the 80/20 solution: the easy solution that gets 80% effect for 20% effort. In this case, putting something in ~/Library/Application Support/your.app.com/. You might name the file something innocent if you want to obfuscate things just a bit. Using the user defaults is easy too.

Whatever you do, don't use the MAC address or an other hardware ID. Users with a network home directory (e.g. in a shared lab setting) will hate you. Using hardware IDs is just evil.

If someone is in love with your program so much that they're willing to break your trial limits, let them. The free software costs you nothing and their good will (and maybe recommendation to others) is worth a lot.

Finally, write software that people want to use and price it for its value. If your price is a good value and people want to use it, most people will pay for it.

How to create a trial version of a Java program

There's a product called Rampart that lets you make a trial version for your Java app. It only takes a couple of minutes and it works pretty well.

You can find it at http://Rampartlicensing.com

How to make a trialware?

using registry or any other recource on client system can make your software easy to crack
Instead of that you may write a licence server and your application can check the licence over that server for each run..