Typically, a font that comes bundled with software (such as Myriad, which comes with several Adobe products) is licensed for use in whatever kind of media the software is likely to produce. The software publisher has taken care of licensing and included the cost in the price of the program. That may vary by foundry, but chances are extremely good that you're ethically and legally covered if you're using a font that was bundled with a major piece of commercial software.

There is also a distinction between the font—the software that renders the typeface, and the typeface—the glyphs themselves. They are treated as distinct by US copyright law, where copyright only covers the font file—the algorithms used to render the typeface. The situation is different for Redrobes because under UK law the typeface itself is protected.

Here's a useful article: The Law on Fonts and Typefaces: Frequently Asked Questions « crowdSPRING Blog