Eavesdroppers can reconstruct video screen content from radio frequency emanations. Many such systems are encrypted to prevent eavesdroppers from listening in. This was done to eliminate or reduce comprehensibility of the conversation by any eavesdroppers. The password is used to encrypt Wi-Fi packets so as to block eavesdroppers. The gangsters used such codes in case of eavesdroppers or phone tappings by the police. Sometimes, songs vocalized in the post-breeding season act as a cue to conspecific eavesdroppers. Eavesdroppers would hear only the noisy signal, unable to understand the voice.