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+This chapter describes some of the key NSPR functions for manipulating
+strings. Libraries built on top of NSPR, such as the Netscape security
+libraries, use these functions to manipulate strings. If you are copying
+or examining strings for use by such libraries or freeing strings that
+were allocated by such libraries, you must use these NSPR functions
+rather than the libc equivalents.
+
+ - :ref:`PL_strlen`
+ - :ref:`PL_strcpy`
+ - :ref:`PL_strdup`
+ - :ref:`PL_strfree`