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Q: 

Are there significant differences between Flash swf 8/9/10?

I know that there is a detailed specification available online, but I could only find one for version 10.

Do you know if reading this specification will be useful for the other versions too, or do I need to actually learn 3 separate (or more) documents to fully understand the format?

And is .swf really fully open source? I don't quite understand the concept of it to be honest.

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