Weak patents get challenged, and sometime get ruled as “invalid.” You want to know that if the manufacturer’s key system patent comes under scrutiny in the court of law that, #1 ‐ the manufacturer has the resources to go to court to defend and protect the patent, and #2 ‐ if the patent has been defended in court, was the defense successful and the patent held up. If you select a key system that doesn’t have a very strong patent you could find that your key system could get compromised in the future by a counterfeit unauthorized, non‐original key.

Language to use in key system specification:
The manufacturer must demonstrate the ability to defend its patents.