But then you want to have backward compatibility so you can play your used games forever.

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We were then shown the AirStash's WebDAV compatibility using iOS' Keynote.

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During the entire hour-plus-long keynote, the word "Vista" was only uttered once, and then only in the context of Windows Live compatibility, and in the same quick breath as Windows XP and Windows 7.

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On the other hand, if APIs are not copyrightable, then this would allow significant freedom for companies to implement clones of existing technologies, without requiring full compatibility.

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