In this paper, the authors propose the definition of a system to negotiate products in an e-commerce scenario. This negotiation system is defined as PLANE (PLatform to Assist NEgotiation) and it is carried in a semi-automatic way, using multi-attributes functions, based on attributes of the negotiated content. It also presents architecture to interconnect the participant through an inter-network in the television broadcaster context. Each participant of the inter-network applies policies for its own contents and all of the users' must comply with these policies. If a participant needs a content not covered by the policies, it is possible to start a negotiation process for this specific content. Experiments present a simulation scenario where PLANE assists the negotiation between three sellers and one buyer with predefined negotiation profiles.