Where can I find information on the licence(s) that govern use of the fonts that come preinstalled on Mac OS X?
From the os license:

E. Fonts. Subject to the terms and conditions of this License, you may use the fonts included with the Apple Software to display and print content while running the Apple Software; however, you may only embed fonts in content if that is permitted by the embedding restrictions accompanying the font in question. These embedding restrictions can be found in the Font Book/Preview/Show Font Info panel.

In FontBook Show Info for Hoefler Text it says "Embeddable: Yes".