Systems, methods, and machine-readable and executable instructions are provided for unauthorized use classification. The content management system includes a filter operable to automatically determine a first protected format of digital content that has been imported into the content management system, and a transformer operable to transform the digital content from the first protected format into a second protected format. The invention is further characterized by that the PSA proteinase inhibitor complex of interest is formed either with 1-antichymotrypsin, 1-protease inhibitor or 2-macroglobulin.