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The SWF file format is available as an open specification to create products and technology that implement the specification. SWF 9 introduced the ActionScript™ 3.0 language and virtual machine. The SWF 10 specification expands text capabilities with support for bidirectional text and complex scripts with the new DefineFont4 tag. The DefineBitsJPEG4 tag allows embedding JPEG images that have an alpha channel for opacity and also a smoothing filter. SWF 10 also adds support for the free and open-source Speex voice codec and for higher frequencies in the existing Nellymoser codec.