On 29.12.2009, at 21:24, Benjamin Rister wrote: > It’s not a serial number collision that causes the inconvenience for your > real customers. > > Once there’s a keygen, you have no way of distinguishing a legit serial from > a non-legit serial using your algorithm, period. The only remedy is to change > to another algorithm, retroactively invalidating all of your paying customers > serials in the process. You can’t just start issuing new serials without > impacting existing customers, because again, you have no way of > distinguishing in the field whether this is a paid customer or not.
Well, usually people keep a record of issued serial numbers. Depending on your scheme this can be keeping the name and e-mail used to register, so you can generate the key again, or the range of "seed" numbers the newest batch of keys was generated from, or whatever. If your records show you never issued a key, you know it's not legitimate. Cheers, -- Uli Kusterer "The Witnesses of TeachText are everywhere..." http://www.lookandfeelcast.com ------------------------------------ MacSB email guidelines: http://tinyurl.com/2g55d6 Use MacSB-Talk for off topic messages: http://groups.google.com/group/macsb-talk Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/macsb/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/macsb/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
