about software serial number

How to make software install serial number?
ybwenAsked:
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rbrCommented:
Sorry I don^t understand your question. Could you pls explain it in more detail.
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satwaCommented:
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ybwenAuthor Commented:
Software delivery is auto-etup,upgrade,
uninstall and run of application software
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ybwenAuthor Commented:
isn't software useful-life register code
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ybwenAuthor Commented:
when i develop setup program,for avoid
illegal use, setup program need produce
serial,but the serial is not single,it is feasible as long as by some rules.flow to develop a very good serial-production program.
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gaurangbhattCommented:
This could help you out.

For every installation kit that you create you must create a key which will be valid for a particular time frame.
Lets say you have a program whose validity as per you should be 30 days from the date of installation.
So what you do is read the system time stamp and store it.
Now you use some form of key number which is added or substracted with every character of the time stamp (which is a simple encryption thing).Once you get this you create an integer for this number.
So this will be your Installation date.
Do it in a similar way for Termination date where in todays date has to be replaced by the day One month after.
While the customer installs it It has to be within One month of the date we created.
Once the installation takes place at customer site the above Installation date is to be replaced by the new one.So also for the termination date.
Remember the Key number because the same number is required for decrypting it.
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