Background: Since the formal adoption of digital video broadcasting's (DVB) widescreen HDTV transmission modes in the early 2000s; the 525-line NTSC (and PAL-M) systems, as well as the European 625-line PAL and SECAM systems, are now regarded as standard definition television systems.
Question: When was widescreen HDTV transmission modes formally adopted?
Answer:<extra_id_0>.
<extra_id_0> early 2000s<extra_id_1>