LCA: The security panel

Some dubious software vendors that sell software with monthly/yearly support contracts that suddenly stop working (with some cryptic error message) when the client decides to stop paying for the support.

This was the case of an accounting software (made by a regional ISV) that stopped working with a "too many files" error 2 months after the last payment, but that would work if the system date was set back.

Now they have an excuse for this: security reasons.