In this chapter, we present a formulation for protecting digital library as intellectual property, especially image digital library. The entire content of digital library assembled by database designers is to be differ- entiated from its individual contents. The digital library community demands an innovative approach for protecting digital library associated with content-based retrieval that dynamically generates indexes to its contents. The entire content with dynamically assigned indexes goes beyond the scope of the conventional copyright protection of the database with statically assigned indexes. The proposed formulation uses the patent of content based retrieval process, and protects its object digital library in.