Well, the domain actually had chalk in it. Anyway, being from Australia I actually just ignored it. If they wanted to bring a charge against me and my product they need to do it in my jurisdiction and, worse, the domain name was from the Italian registry, and they would have even more trouble with their claim there.
There claim was spurious anyway, just because they have trademarks on the 'Blackboard' (a generic term anyway) regarding education software, doesn't mean they have a claim to the word 'Chalk' for non-educational software. Blackboard just have over-active lawyers.
