If you can record a CD with your recorder, someone else can read it and then re-record it in another recorder.
There is nothing that you can do about that.
Commercial CD copy protection works by using specially modified master 'recorders', which are able to write CDs that most recorders cannot record.
Your only option is encryption, or a similar procedure. As to how you protect data from being copied after decryption - that probably a very hard task as well.