Deployment with Serial?

I have been creating software for a while now..I have always created software for my company and didn't require a person to enter a serial. Now I have to create software for another company and will require them to enter a serial during the install.
I'm using installshield to package the software but I'm not to sure one how to request a serial. will I have to include a file that holds all the serials or is there software I can use to do this for me.

any help will be helpful.
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Hi moralju,
No you generally do not keep all the SerialNumbers.
The easeast way is to make an Algorithum. If the keys enetered are accepted by that algorithum . Thats ok
e.g. An algorithum could be, make five boxes like Windows XP key and each should have five Alphabets, the sum of each alphabet ascii in a box should be some number as of previous boxes but the char should not be the same.
Usually softwares use much sophisticated algorthums which are hard to crack


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