What happened - more plainly than Consumerist opaquely put it - is that Monster posted a downloadable MP3 featuring a 23-minute medley of excerpts of music from the band as mixed by DJ Z-Trip at Ruckus in the Rockies. The event actually took place right after Yauch's passing earlier this year so it's not that surprising that the DJ-heavy event paid tribute to him.
The sports drink company also allegedly implied that the Beastie Boys consented to the free download, saying:
You can read Consumerist's original report here.
With tracks from the Beastie Boys putting you in the vibe and a sponsorship from Monster Energy, this edit will make you want to ride and party like no other."