In a nutshell, Staggs shows how to build a serial number (seed, keys, checksum), which keys verification in the final product is partial - so that a cracker would hardly be able to build a long lasting keygen. 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. Apparently the remarkable technique first appeared around 2003 in a set of slides by Chris Thornton, developer of the ClipMate software. 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.
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