Prince, I trouble understanding what you say, between porn and entropy, the method mentioned was just an example to make you understand the concept, but you can use any other method or compressor, put first, remove or add "srep, rep, lzma with or without 4x4 etc.." you'll get to max than 10% less than the estimated compression ratio on the entropy of a file.
Or you can make magic with a compressor as "LZAF" Shhhh ... ehhh Oh Yes, someone has already read what you write.
