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Re:Show HN: I Made this Y Combinator T-Shirt (Words from PG'... by shii on Tuesday May 24, 2011 @04:34PM (#2581526)
The logo is CC Attribution 2.5[1]. I'm not sure what the status of his essays are. His site has (c) Paul Graham, so I'm not sure what's up there.

[1]: http://apps.ycombinator.com/item?id=2233123

Re:Show HN: I Made this Y Combinator T-Shirt (Words from PG'... by HardyLeung on Tuesday May 24, 2011 @06:23PM (#2581923)
A fair use of a copyright piece of material.