cssc is a tiny compression utility for style sheets (css files). It reduces the file size user have to download without any visible changes to the page layout and thus decrease the load time. The compression is lossy - it skips comments, all redundant whitespaces, converts 6-chars #rgb notation to 3-chars, and skips last ; in a block.
It should not be only used to make the source more difficult to read. This will not help you, belive me.
cssc does not remove the heading comment - reserved as an information for readers - and does not convert rgb colors into name and vice versa - the color name value is browser-specific.
Enjoy - Viliam Holub