Methods, apparatus, and articles of manufacture to encode auxilary data into text data and methods, apparatus, and articles of manufacture to obtain encoded data from text data

An apparatus to encode auxiliary data into text data, comprising:

• a data unit group assignor to assign source data to one of a plurality of groups, the source data comprising text data;
• a symbol group assignor to assign a symbol to be added to the source data to the one of the plurality of groups;
• and
• a data unit encoder to generate encoded data by including in the source data a text character representative of the symbol.

A computer readable storage medium comprising computer readable instructions which, when executed, cause a processor to at least:

• assign source data to one of a plurality of groups, the source data comprising text data;
• identify a symbol to be added to the source data based on an assigned group of the source data;
• and
• generate encoded data by including in the source data a text character representative of the symbol.