Trial version code (or software) for Excel addin? 1

[knifey]

Hi,
I have a few Excel addins that I would like to sell on a website. Can anyone offer any advice on the best way to implement a professional looking 30 day trial period (e.g. with serial numbers)?
I would be happy to use 3rd party sofware, or reinvent the wheel if needed.
Any pointers would be much appreciated.
K

 

[knifey]

bump

 

[dgillz]

I actually wrote an addin with a 30 day trial. I hard coded the expiration date into each one I sent out, but there are surely more elegant ways of doing that. Then in the code I went to time.gov to get the current date. If the date was beyond the trial expiration date I simply made the menus gray out and displayed a message box that the trial had expired.

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