If you know ITCs and you're going for CL I suppose you know what you are doing. If not, perhaps start at Wikipedia on Vector Clocks. See also the original paper and the original implementation. A implementation in Python is also available.
Matters or style, praise or abomination are very much welcome to be discussed. Our mission at CoselTech is total customer satisfaction.
The project page at the source specifies the LGPL, though the Erlang source file on which this implementation is base states EPL. I do not wish to introduce any further directives or restrictions.