public class AddValidationInformation
An example for adding Validation Information to a signed PDF, inspired by ETSI TS 102 778-4
V1.1.2 (2009-12), Part 4: PAdES Long Term - PAdES-LTV Profile. This procedure appends the
Validation Information of the last signature (more precise its signer(s)) to a copy of the
document. The signature and the signed data will not be touched and stay valid.