It is important to have black-box-like feature sets in vehicles. If video recorded just prior to an accident can be retrieved, it is really handy for insurance companies and possibly as additional record for legal proceedings. Having said that, it is important that the video data are not misused. There are ways in which secure solutions can be implemented using the secure features available on some embedded processors that prevent people from tampering or misusing the video data. – Anshuman Saxena, Texas Instruments
It makes perfect sense that if a person was intentionally speeding and got in an accident, they would not want the data to remain intact. Thus, I suspect that there will be an aftermarket for data tampering under the guise of "data security."