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Mathematica > Core Language > Defining Variables and Functions > Attributes > ReadProtected >

BUILT-IN MATHEMATICA SYMBOL

ReadProtected

ReadProtected
is an attribute that prevents values associated with a symbol from being seen.

Individual values associated with read-protected symbols can be used during evaluation.

Definition[f], ?f, and related functions give only the attributes for read-protected symbols f.

Out[1]=

Definitions of a read-protected symbol are not shown:

As long as the symbol is not locked, the read protection can be removed:

If a symbol is locked and protected, its definitions can be neither changed nor read: