This work proposes a content-based approach for structured document obfuscation, which is based on Secret Share techniques implemented at the Edge of a computing system. The key innovation of our work is to increase the flexibility in data sharing, keeping data at the Edge, and improving data security, reliability, and availability. The proposed solution can also suit more complex scenarios that include continuum capabilities towards the Cloud, to benefit from high computing resources. We present the details of our work and the implementation. Then, we evaluate the performance at the Edge of the proposed approach, comparing it with its traditional implementation applied to the entire document. The goal is to analyze the differences in performance and security between the two approaches.