Network resources are subject to automated downloading of information by automated-agents that cause business- or user-specific data to be compiled en masse. In order to control resources and information available to automated-agents, markup documents or elements of markup documents are obfuscated such that a client must reconfigure the obfuscated information in order to display the requested content contained in the document. The obfuscation is applied such that the content will render and display to a human user in the same manner as if the element was untransformed; however, the markup will appear syntactically different to an automated-agent. Thus, in response to a user request, a server can transform elements of a structured document and provide the transformed document to the client for reconfiguring and rendering.