TIdDecoderQuotedPrintable = class(TIdDecoder);

TIdDecoderQuotedPrintable is a TIdDecoder descendant that implements the decoding algorithm for the Quoted-Printable encoding scheme. 

TIdDecoderQuotedPrintable will convert values that have been encoded using TIdEncoderQuotedPrintable to their original un-encoded state. 

TIdDecoderQuotedPrintable conforms the decoding algorithm as described in the Internet Standards document: 

RFC 2045, Multipurpose Internet Mail Extensions (MIME), Part One: Format of Internet Message Bodies, Section 6.7 Quoted-Printable Content Transfer Encoding