Nothing wrong with that, and if you roll your own it's going to be free (just your time to code and debug it). What you're thinking about doing is basically creating your own licensing module. I find it strange that in all the years I've been coding, I've never actually seen an implementation or description of these techniques. Otherwise, can you recommend some good books or websites which discuss this? What techniques are used in encoding this information in a serial number? If you could give a brief overview that would be great. The serial has some special mathematical properties which allow the program to check if it is valid, what license it corresponds to, and when it expires. Generate a serial for the customer and email it to them. The serial has no specific format/mathematical rules, it is simply checked against the database on the server. The server returns the license privileges and expiration. The software connects to server during installation and activates the product. Generate a serial on the server where user buys software, and email it to them. There are at least two conceptual ways I can think of to accomplish this: Additionally, I want the serial number to store which edition of the software they have access to, and when the license expires. I want to be able to request a serial number from the user during installation which will validate that they have a licensed copy of the software.
It's part of the life process.Let's say I have written a program and want to distribute it to people.
There was the 33 rpm disks, the magnetic tapes, the 5" 1/4 magnetic disks, the 3" 1/2 magnetic disks, the CD disks, the DVD disks and now the BlueRay ones.Įach new format brings new interesting feature and break some kind of compatibility. It's often useful to create new things, even we don't like it: rtf files then? A format the everyone can read, not some stupid new made up format that nothing else can read. It's my own rule and it works well.Īnd even so, why doesnt Pages default save as. doc file, the doc is directly thrown to the trash and the sender asked to send a file which I may read.
Since I didn't bother to keep the OSX instruction book, the Serial number for iWork (which comes with the Macbook) was obviously thrown out as well. I hate retail boxes and usually save all my program serial numbers in a separate place. Windows Vista suits my needs much more than Mac OS X does.
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