After entering your Adobe account and password, Adobe Digital Editions will start downloading the content. When you drop an ACSM into Adobe Digital Editions for the first time, it pops up a window prompt you to authorize the computer with Adobe ID. ACSM (stands for Adobe Content Server Manager) is not an actual eBook but a link – a link to download the actual eBook in Adobe Digital Editions (abbreviate to ADE). You probably have got some eBooks, magazines from the internet, or purchased some eBooks from Kobo, Google Play Books, and the publisher gave you ACSM files. So the question now is: how to remove DRM from Adobe Digital Editions?
By removing Adobe DRM, you will get DRM-free PDF/EPUB that can be read on almost any reading device and program. If the FileOpen security model ever got seriously broken, we would probably have to remove NR3 from the web, which would be too bad for legitimate users (and for us!).If you have downloaded some books in ACSM format, these files can basically only be opened by Adobe Digital Editions, and Adobe Digital Editions will download the content as DRMed PDF or EPUB files. But, for now, it seems good enough to allow an acceptable business model and let us offer NR3 online. There is no such thing as perfect security, and we are certainly not attempting that - there are at least several holes in the above security model. So your statement that anyone with the plug-in can read the file is not correct - they also have to be subscribers. If it is authorized, it decrypts the file (all within Adobe Reader).
The specific plug-in that we use, the FileOpen plug-in, verifies that your specific machine (as defined by hardware configuration and stored subscription information) is authorized on a specific subscription. However, the Adobe specifications allow for the possibility that the content of the PDF file is stored in an encrypted form, and that the decryption algorithm is in a plug-in. The NR3 files are standard PDF files, in the sense that they completely follow the specifications set by Adobe.
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