Typical speed camera traps have built-in OCR software that is used to recognize license plates. A clever hacker decided to see if he could defeat the system by using SQL Injection… ...

SQL Server databases often contain precious data such as customer information, financial records, and account passwords-assets that are often both essential to the business and subject to compliance ...

Etc. The first issue; selling a system that inherently includes sourcecode isn't a big deal. Making it clear to the purchaser that they have limited rights requires a decent contract.