Any attempts to alter historical events, disrupt the space-time continuum, or engage in time-traveling shenanigans will be met with swift and severe punishment. Offenders will be subject to temporal reeducation and/or time-sensory deprivation.
Exceptions: Authorized Time Travelers, Temporal Agents, and Chrono-Cops are exempt from this regulation. However, even they are not immune to the wrath of Time Police Department's Temporal Disruption Task Force.
For more information on Temporal Regulation 1, see Article 1: The Grandfather Clause.