"NB: Jobs mistakenly attributed it to Picasso, who never said such a thing. Jobs probably read Richardson’s biography of Picasso, in which the text is misquoted and attributed to T.S. Eliot."
The quote you have above is in fact T. S. Eliot's words, in reference to Massinger, from his selection "The Sacred Wood: Essays on Poetry and Criticism", 1921.
If you re-read the citation, you will see her intention that _neither_ T. S. Eliot nor Picasso specifically said "Good artists borrow, great artists steal" but a "bastardization" of Eliot's original writing.
Eliot's intention, "A good poet will usually borrow from authors remote in time, or alien in language, or diverse in interest." would discredit every technology company or figure that has been defended by the cliche.
http://en.wikipedia.org/wiki/Steve_Ritchie