Security and Liberty Preservation Act - Establishes the Commission on Enhancing Security and Preserving Freedom to conduct a thorough investigation of: (1) standards for using, selecting, and operating investigative and surveillance technologies to meet law enforcement and national security needs in the manner that best preserves the personal dignity, liberty, and privacy of individuals within the United States; and (2) the advisability of establishing Government entities or procedures to ensure that the Government complies with such standards.