I personally think the online authentication of registration key is acceptable, if customer’s privacy is properly protected. As Paul said, there are many other software companies protect their products via online authentication, including gigantic ones like Microsoft and Adobe.

But I believe if EmEditor provides more informative instruction to users in different situation, such as those don’t have internet connection, Paul would be more satisfied, since most of companies described above provides very informative instruction and (or) alternative way for accomplishing the authentication task. :-)