Digital Rights Management (DRM) options for books on Google Play
You can choose if you would prefer not to apply Digital Rights Management (DRM) software to the digital file download of your book. DRM is intended to protect the content owner and keep e-books secure from unauthorized sharing. If you choose to make your book available on Google Play without DRM, then consumers will have more flexibility in using the content file. To turn off DRM, go to the Book Catalog of your Partner Center account, click the book's title, then click Settings tab and under Distribution settings, uncheck the box labeled DRM Enabled. There's also a template-level setting to disable DRM for any new books.
For DRM on download files, Google will support Adobe Content Server 4, the leading open, cross-platform protection solution in the industry with more than 150 publishers and content aggregators using Adobe's technology today. Google will require users to link the Adobe DRM software in their books via a one-time authentication per reading system. These devices may then request ACS4-encrypted EPUB or PDF files via a Google-provided API.
Note that due to technical limitations, large DRM-enabled books (greater than approximately 128 MBs) will not be made available for download.