Do the manufacturers who build airplanes use their own "black boxes" in the planes, or are there companies whose sole purpose is to develop black boxes?
For example, in 2010 in the Airblue Flight 202 incident, the black box had to be sent to Germany for data recovery:
He stated that the box would be examined by "foreign experts" in Germany or France as Pakistan does not possess the equipment to decode the flight recorders. He also stated that the process of extracting information may take six months to a year. The Pakistani authorities decided to send the CVR and FDR to the Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (BEA) in France.
It is not clear who developed that black box. Was it the same company that manufactured the airplane?
Also, can the buying airline use their own black box or their own security protocols for data encryption or encoding, to avoid having to send the black box out for analysis?