Individual writing behaviour is based on the neuro-muscular memory.

A person can definitely know what to write but not how it has been written; thus, his behaviour cannot be lost, stolen or given away.
As such behaviour slightly changes from one signature to another, the sensor output acts as a random number generator.
This implies that any time a signature is recorded, there are four parameters that change in the output data flow (individual variation, sensor output, pen codification and time-stamp received form the host), which makes it extremely hard to decode the system behaviour.

Even if someone stole the original sample of the written signature (on image or paper), the signature electronic template saved in the database or even the pen itself to "skim" data from the PC, he would not be able to understand what behaviour is attached to the signature.

Signing with Bio-Pen leads to a "decay" of the signature quality. This is exactly what happens with a traditional pen. The system refusal threshold (non-validation) is usually reached after 10-15 signatures; in this case, a brief pause is enough to restart signing. The system, in relation to the document processing to carry out, allows setting the acceptance threshold.