I put the customer's database ID into their serial number so I can track any key back to the purchaser. I also encode date of issue into the key. If the key isn't used to authorize the software within three days of issue, it won't be accepted. Cuts way down on key sharing. I got the idea from this excellent article:
http://www.ambrosiasw.com/forums/index.php?showtopic=34059 On Jan 1, 2010, at 11:07 AM, Uli Kusterer wrote: > On 29.12.2009, at 21:09, Markus Spoettl wrote: > > Well, you don't use the license data to derive a key from it. No sensible > > solution does that. > > Actually, many do that, if they can. And it's actually good, because it means > you can put the name and e-mail of the customer that bought a particular key > into a visible spot in the application. If someone gives away the key, they > also give away their name and e-mail address. [Non-text portions of this message have been removed]
