Typically registrars lock up domain names upon receipt of either a court order
or a UDRP notice (and a real one at that) to prevent any possible monkeying
around with them intending to avoid liability. People generally don't know the
devil in the details, especially when they don't read their agreements. (hint)
While no one's required or forced to read them, ignorance hasn't typically been
known to excuse or shield anyone from problems. Then again, even if you did,
that doesn't stop others from disputing your rights once in a while.