Are there any other requirements for developing with InDesign CS4 Server?
Commercial development partners are strongly advised to have a current membership in the Adobe Solution Partner Program, preferably at the Silver level. This membership provides a channel for receiving development support and other benefits tailored to the needs of commercial development partners, including complimentary software, upgrades of selected products, access to other Adobe SDKs, general technical information, and co-marketing opportunities. As of March 2009, the cost is $2,495 per year. Read more about the Adobe Solution Partner Program. Customers performing their own in-house development can purchase single or multipack development cases. Visit the developer support page for more information.