able to the decoding process prior to its activation. Any picture parameter set NAL unit containing the value of pic parameter_set_id for the active picture parameter set RBSP for a coded picture shall have the same content as that of the active picture parameter set RBSP for the coded picture unless it follows the last VCL NAL unit of the coded picture and precedes the first VCL NAL unit of another coded picture. When a picture parameter set NAL unit with a particular value of pic_parameter_set_id is received, its content replaces the content of the previous picture parameter set NAL unit, in decoding order, with the same value of (when a previous picture parameter set NAL unit with the same value of pic_parameter_set_: was present in the bitstream). NOTE 2 - A decoder must be capable of simultaneously storing the contents of the picture parameter sets for all values of pic _parameter_set_id The content of the picture parameter set with a particular value of pic parameter_set is overwritten when a new picture parameter set NAL unit with the same value of pic_parameter_set_ie is received. A sequence parameter set RBSP includes parameters that can be referred to by one or more picture parameter set RBSPs or one or more SEI NAL units containing a buffering period SEI message. Each sequence parameter set RBSP is initially considered not active at the start of the operation of the decoding process. At most one sequence parameter set RBSP is considered active at any given moment during the operation of the decoding process, and the activation of any particular sequence parameter set RBSP results in the deactivation of the previously-active sequence parameter set RBSP (if any). When a sequence parameter set RBSP (with a particular value of seq_parameter_set_id) is not already active and it is referred to by activation of a picture parameter set RBSP (using that value of seq_parameter_set_id) or is referred to by an SEI NAL unit containing a buffering period SEI message (using that value of fesquarameter_set_id), it is 