[ Packet Type 10 ] - 0x0A - Server to Client - UserName Invalid Notification

      <PacketLength><PacketType><Empty>


      The server sends this message in response to the "Username Free Query" <7> Packet, when the specified
       username is invalid, usually due to bad characters such as spaces or other non-printable characters.

      The Napster, Inc. servers only accept (upper- and lower-case) usernames comprised of the following:

      abcdefghijklmnopqrstuvwxyz1234567890_[]{}-@^!$


      NAPSTER  Compatible
      OPENNAP  Compatible
      SLAVANAP Compatible