1. A method for decoding an encoded bitstream, comprising: a reception step for receiving a codeword from the encoded bitstream; a selection step for selecting between a first decoding mode and a second decoding mode to decode the codeword, the first mode using a first type of entropy decoder other than a Run-Length decoder and the second mode using the first type of entropy decoder combined with the Run-Length decoder; an adaptation step for adapting the decoders of the first mode and the second mode using a backward-adaptive technique; and a reconstruction step for reconstructing a value of digital data from the decoded codeword.