What technology do govt departments across the world use to maintain trustworthy records?[1] Some Indian departments use pdf with DSC for this. Interested if t

What technology do govt departments across the world use to maintain trustworthy records?[1] Some Indian departments use pdf with DSC for this. Interested if there are alternatives. [1]: http://www.epa.gov/records1/faqs/rks.htm#q4 http://www.epa.gov/records1/faqs/rks.htm#q4