I think the problem regarding the designs/schematics/source-codes, is that so long as the technology is still viable, it pays to keep them secret.
The moment things go bust or products become obsolete, there is no interest or need for a company to invest time/resources in archiving this information.
After a few years, the original technology is all but lost. I've had old nostalgic game consoles that I've wanted to resurrect, but it's not so easy 20 years on.
I think the problem regarding the designs/schematics/source-codes, is that so long as the technology is still viable, it pays to keep them secret.
The moment things go bust or products become obsolete, there is no interest or need for a company to invest time/resources in archiving this information.
After a few years, the original technology is all but lost. I've had old nostalgic game consoles that I've wanted to resurrect, but it's not so easy 20 years on.