In digital signal processing, Finite Impulse Response (FIR) filters are fundamental components that govern behavior by specific coefficients. Protecting these coefficients from adversarial discovery is crucial, and prior techniques have introduced obfuscation through decoys or key bits. However, these methods remain vulnerable to query attacks capable of revealing secret keys. This work introduces a novel hybrid protection technique that combines hardware obfuscation and logic locking, utilizing a point function to secure parallel direct and transposed forms of FIR filters. Additionally, a Proportional-Integral-Derivative (PID) controller is integrated to enhance system performance and resilience. An innovative unlock function is also developed to ensure controlled access to the protected coefficients. Experimental results demonstrate that the proposed technique offers superior security, protecting against prominent query-based and logic attacks while maintaining competitive hardware complexity. The protected multiplier blocks and FIR filters, including the integrated PID controller, show enhanced security and efficiency compared to traditional methods.