This Recommendation | International Standard specifies a set of Packed Encoding Rules that may be used to derive a transfer syntax for values of types defined in Rec. ITU-T X.680 | ISO/IEC 8824-1. These Packed Encoding Rules are also to be applied for decoding such a transfer syntax in order to identify the data values being transferred.th edition 2021-06 Information technology — ASN.1 encoding rules — Part 2: Specification of Packed Encoding Rules (PER) Technologies de l'information — Règles de codage ASN.1 — Partie？2:？Spécification？des？règles？de？codage？compact？(PER) Reference number ISO/IEC 8825-2:2021(E) ？ ISO/IEC 2021 ISO/IEC 8825-2:2021(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO/IEC 2021