A method including putting in place an end-to-end secure network, digitally signing the recorded data, regardless of its type, encrypting the recorded sensitive data, and putting in place a key management infrastructure for the creation, the renewal, the distribution and the repudiation of the keys, and putting in place an evidence administration process which guarantees the time-stamping of the digital signature, the validation of this digital signature and the ultimate archiving of the legal evidence of the integrity and of the authenticity of the video stream.