how can i create license for my window application ??

i want to create license for my window application ...
every 6 months license expired and first 30 days subscription .
means user can use my application for 30 days only then he/she can't ...

how can i create license for my windows application ??
Who is Participating?
John ClaesConnect With a Mentor Senior .Net Consultant & Technical AnalistCommented:
Installing :
Request all Disk info

Add Date Of installation +30 days

Save data in Licence file (Decrypted with own decrypter/Encrypter)

Licence Demand
Give user possiblity to demand Licence : send  Licence file to you
Encrypt File :
Change Date Of Installation to today + 6 months
Respond with altered Licence file

You're program should check:
On startup :
Get Licence File
Request all Disk info

If Disk Info of x-1 on x of the Disks is OK (Can Occure that HD is changed otherwise all disks are OK)
So every disk must be the same only 1 may fail

Check date.

If in case 1 Disk Failed : rewrite Licence File :

This way the folowing check will not fail ;-)
and the user sees a changing licence File so he won't hastly edit in it

poor beggar

Parth48Author Commented:
create class for license and use it for whole application ...
or you can go with advanced techniques like checking for hard disk serial number, processor ID etc..
Manoj PatilSr. Software EngineerCommented:
Hi, you can create this type of application by using Hardware ID. For more details please check following link
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