What is a handwritten biometric signature?

A handwritten biometric signature captures the rhythm of the signer dynamically.

It captures the X, Y, T, and P coordinates (T=time, including the time the pen is in the air. P=the pressure variants that the signor exerts at the time of signing.

The captured data is stored as an encrypted blob inside the document for the lifetime of the document and can be examined in a court of law digitally.