Technologies are generally described for methods and systems effective to generate modified content data. In some examples, the methods may include obtaining, by a processor, identification data associated with an identification. The processor may generate offset data using the identification data, where the offset data may include an indication of the identification. The processor may determine first position data that may be effective to define a first position of a first object and a second position of a second object in a source document that corresponds to source content data. The processor may generate second position data using the offset data and the first position data. The second position data may be effective to define a third position of the first object and a fourth position of the second object. The processor may generate the modified content data by application of the second position data to the source content data.