The BitKeeper license changed in a way which I interpreted to mandate
publishing the repository contents under a free software license. (it in
fact just required making the contents of the repository available)
I kept layouts of the boards in the repository which were neither under
my copyright nor free.
Thus, I believed was no longer able to use it.
(I'm now using Subversion for
this and other projects.)
Since then, the BitKeeper license changed once again and now includes a
non-compete clause. The current license requires mandatory upgrading, even
if the new license has changed.