There is no Linux version in development (or planned) by Adobe. Once used there is no way to recover the activation, however your activation count does grow over time to account for this. Also we do not provide a way for end users to tell how many activations are left. If you run out cotact tech support by opening a web case and they can look at your activation history and add activations if needed.
I see. Lol.
Adobe Digital Editions for Linux platforms and localized versions in French, German, Japanese, Korean and Chinese are expected to be available in the second half of 2007. (http://www.adobe.com/aboutadobe/pressroom/pressreleases/200706/061907DigitalEditions.html)
No way to recover ... no way to check ... seems to me like half-baked solution. Hopefully DRM dies out - obviously it is more bother
than anything else and it is kind of sad that it is easier to steal an e-book than buy it ...