Adobe have opened their .flv and .swf formats, according to their release here.
Some key things they're promising:
• Removing restrictions on use of the SWF and FLV/F4V specifications
• Publishing the device porting layer APIs for Adobe Flash Player
• Publishing the Adobe Flash® Cast™ protocol and the AMF protocol for robust data services
• Removing licensing fees - making next major releases of Adobe Flash Player and Adobe AIR for devices free
From the CEO:
A consistent, more open platform for developers will drive rapid innovation, vastly improving the user experience.