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 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.
