> Copyright infringement requires distribution, that is the core of the offense.
Infringement does not require distribution. The rights encompassed by copyright include reproduction, derivation, distribution, public performance, public display, and broadcast rights. Infringement of any of those rights is copyright infringement. For US law, see at least 17 USC 106(a) abd 501(a).
The tort of copyright infringement is as you describe it.
When people say copyright infringement requires distribution they mean you can't be tried in a criminal court for merely copying you can still be sued.
> The crime of infringement requires distribution.
At least in the US, criminal copyright infringement may be for any act of infringement. The statute 17 USC 506(a) [0] describes the necessary conditions for a criminal prosecution, which are not limited to reproduction or distribution. Here [1] is a nice article from the department of justice about the crime.
