Archives For Licensing

Back in 2007, developer Brandon Staggs wrote a brilliant article about software licensing, showing how to implement what he calls a Partial Serial Number Verification System using the Delphi language.
Apparently the remarkable technique first appeared around 2003 in a set of slides by Chris Thornton, developer of the ClipMate software.

Years have passed, cryptography is more affordable, yet I would say that this approach to the Software Licensing problem is still valid in some businesses – besides the fact it’s fascinatingly clever.

In a nutshell, Brandon shows how to build a serial number (seed, keys, checksum), which verification in the final product is partial – so that a cracker will never be able to build a long lasting keygen.

I’ve ported the original code (written in Delphi) to Javascript.

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