The described technologies can be used for masking one or more heterogeneous digital contents. One or more heterogeneous digital contents can be received from one or more data sources. Further, the received one or more heterogeneous digital contents can be parsed by a first parser unit to obtain a portable format data. The portable format data can be a homogeneous digital content arranged in one or more layers. Further, masking of the portable format data can be performed by a masking unit. A masking methodology can be applied based on selection of one or more rules from a plurality of rules to obtain a masked portable format data. Further, reverse-parsing of the masked portable format data can be performed by a second parser unit to obtain a masked data. Structure of the received one or more heterogeneous digital contents remains preserved.