Twitch will implement Audio Recognition technology on all VODs in an effort to combat the use of "unauthorised third party material". The scans will apply to past streams only: live streams will remain unaffected.
Twitch has partnered with Audible Magic to remove all unauthorized material from stored content it hosts, and the approach they're taking is ruthless to say the least. Audible Magic scans videos in 30 minute blocks, and if a fraction of that block is found to contain third party material, the whole 30 minute block will be muted. This can include ambient background music as well as in-game music, depending whether those tracks are stored in the Audible Magic database. This will be a huge hit to Twitch, considering it is entirely based on people streaming their games.
The news has angered Twitch users, especially in light of rumours that YouTube/Google is attempting to buy Twitch, which makes sense considering they use the same audio muting technology. When YouTube implemented this in late 2013, it resulted in widespread take down notices among gaming channels and even the redirection of profits to copyright holders.
Twitch has also announced that big changes are coming to its video on demand service, including better service for international viewers, easier YouTube exports and increased length of default rolling storage for past broadcasts. The negative side to all these "improvements" is that the "save forever" option is being eliminated.
Existing past broadcasts will be left alone for three weeks, after which Twitch will begin deleting them from its servers. To make life easier for people who want to keep them around, it's released a new video manager that will simplify the process of creating highlights and exporting broadcasts to YouTube. They have temporarily disabled the YouTube exporter, but it will be back up, soon.