You can set up your own Adobe Content Server, but prices start at $6,500 for the software (of course this isn't practical in most instances)...
https://store1.adobe.com/cfusion/sto...S-US&loc=en_us
Pricing details...
Quote:
Initial fee
Adobe Content Server 4 is available for the initial fee of $6500, with no limits on the amount of content you can protect and distribute or on the number of CPUs on which you can install the server. The initial fee includes the server software, the first year of access to the Adobe digital signing service, and maintenance, support and upgrades as provided for by the License Terms and Conditions for Content Server 4.
Adobe digital signing service fee
The initial fee also includes a one-year service plan that enables you to access Adobe's digital signing service as well as receive Adobe Content Server software upgrades, maintenance and support as provided for by the License Terms and Conditions. Customers are required to renew this service plan every year for $1500.
Transactional fee
In addition to the initial fee and signing service plan, Content Server customers are charged a small fee per transaction. Whenever you sell or loan content, a request is made from Adobe Content Server 4 to an Adobe License Service for a digitally signed license. Once signed and returned to your server, the license and protected PDF or EPUB file are available to your customer.
Whenever a transaction is signed, a small license fee is charged to your account. The amount depends on the type of license you select, of which there are two types:
• A permanent license gives the user access to the signed content forever. For each permanent license, you are charged $.22.
• An expiring license lasts between 0 and 60 days, after which time the content is no longer available to the end user. For each expiring license, you are charged $.08.
These charges are billed on a monthly basis to the credit card used in the Adobe Store for purchasing the initial fee.
Solutions provider
Solutions providers and companies that use Adobe Content Server 4 to enable retailers, libraries and others to distribute content may qualify for discounts. For more information, please contact contentserver_sales@adobe.com.
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I suppose one could develop their own DRM for an ePub instead of using Adobe's method, of course it's likely few would be able to actually read it.