The present document describes system and method for securing a text against copying and tampering. The system introduces a reversible change within the instructions contained in the electronic page description language defining the text. In a non-limiting example, the reversible change may include replacing the font used in the PDL by a customized font defining a set of changes from the standard/existing fonts. The system may then generate a set of instructions reversing the set of changes to display the proper text to the user. However, should any tampering or illegal copying of the text occur, the original text will not be displayed because a portion of the reversible change is not present. The reversible changes introduced may affect character sizes, colors, spacing, positions, mapping etc.