Since all current ebook DRM (except maybe Apple's?) has been broken and is easily removed IMO all you're doing is adding extra expense for you and hassle for your customers. However if you wanted to sell ePubs with Adobe DRM what you'd need to do is setup an Adobe Content Server.
From Adobe's site...
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.
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