How to key java software to the machine.

Question

Hi Everyone;
I made a java standalone app.
However, I would like to add security so that people can't easily make a copy of the classes/jar file and email it to friends.
One of my thoughts was to dynamically key the software to the person's computer somehow. And give them a per pc license agreement.
QUESTION #1: Does anyone have any thoughts on how I would key it to the computer the first time it starts up?
QUESTION #2: Another option of mine is to require the user to enter their phone number as a type of serial key at the beginning of each usage. Because the phone number is kinda private and they won't want everyone in the world to have their phone number. So my question is when the user is going to download the software from my web site - is there a way to dynamically add the phone number to the class compile and jar it and send it to them. if so could someone explain how ?
Thanks in advance
Stev
Stephen

Answer 1

Theres the stnadard, enter your name, phone, address and then you give them a code that will only work with that name phone, address, etc, maybe even have it work with the date. Or if you can take the MAC address from a piece of hardware (assuming that they don't replace it) or some other number that can be aquired from the hardware through code, and base it on that...there are many many ways, and people usually crack most of them if the program is important enough. The only one i have seen work are ones that force you to authenticate over a network...