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Prior work has developed techniques capable of extracting deep learning (DL) models in universal formats from system memory or program binaries for security analysis. Unfortunately, such techniques ignore the recovery of the DL model’s programmatic representation required for model reuse and any white-box analysis techniques. Addressing this, we propose a novel recovery methodology, and prototype ZEN, that automatically recovers the DL model programmatic representation complementing the recovery of the mathematical representation by prior work. ZEN identifies novel code in an unknown DL system relative to a base model and generates patches uch that the recovered DL model can be reused. We evaluated ZEN on 21 SOTA DL models, including models across the language and vision domains, such as Llama 3 and YoloV10. ZEN successfully attributed custom models to their base models with 100% accuracy, enabling model reuse.