 The first is the manner in which the signal is being transmitted and the second relates to the copyright content of the material being transmitted such as DVDs and TV programmes.Transmitting signals wirelessly requires the product to be tested to relevant standards for wireless license exemption, these products are generally limited to 100 mW (10 mW in the UK) and for higher power models, used generally within the broadcasting industry, a licence is required.If the broadcast is across LAN or via similar IP technologies, such as the internet, then using streaming technology does not require a license.