Copyable

is an option for Cell that specifies whether a cell can be copied interactively using the front end.

Details

Even with the setting Copyable->False, the expression corresponding to a cell can still be read into the kernel using NotebookRead.
With Copyable->False set at the notebook level, no cells in the notebook can be copied interactively in the front end.

Create a document with one cell that can be copied and one that cannot:

Select both cells:

If you copy this selection and paste it to a new notebook, only the first cell is copied:

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