> For LZ algorithms, the dictionary made when compressing the first version would be reused for subsequent "versions" of the same document. So sort of a static

> For LZ algorithms, the dictionary made when compressing the first version would be reused for subsequent "versions" of the same document. So sort of a static dictionary, but specialized for what you're sending. Ah, so you mean something like what SDCH does. This works well for files that are smaller than the window size and has rewards rapidly diminishing with filesize past that.