Should the word "donorship" apply here rather than commercial? I know from my many years in college
radio that we can take donations and acknowledge them with announcements and we can't give prices or use superlatives. "The restaurant offers chicken, ribs, and soup" instead of "For the best chicken you'll
ever find..."
"Donorship" is just another word that people who work in the industry have come up with to describe the (admittedly confusing) world of underwriting.
www.fcc.gov/mb/audio/nature.html
If we're going to use "official" FCC terminology, there's advertising (commercial) and then there's underwriting (non-commercial) and that's it. Non-commercial licenses may only air underwriting, which has the following content restrictions:
1. May not be longer than 30 seconds.
2. Must not contain any call to action.
3. Must not contain any inducement to buy/sell/lease. (i.e. limited-time sale info)
4. Must not contain any mention of price in any form. (includes percentages, also "free" which is a price)
5. Must not be promotional.
The first one is actually that the FCC doesn't see how any underwriting spot more than 30 seconds couldn't be promotional in nature, and thus prohibited.
The last one is the tricky one. NPR and NPR stations, for example, are very, very good about adhering to 2, 3 and 4. But 5 is so vague it's hard to really know for sure, and NPR tends to push the envelope quite a bit. It's easy to make arguments either way with most language in underwriting spots. Something that is technically factual can also be viewed as promotional, too. For example, a business that says in a spot that it's been in business for 20 years is considered inherently promotional because it's implying that it is better than another, similar, business that hasn't been around as long.
To make it even more vague, I quote from the above URL: "In March 1984, we relaxed our noncommercial policy to allow public broadcasters to expand or "enhance" the scope of donor and underwriter acknowledgements to include (1) logograms or slogans which identify and do not promote, (2) location information, (3) value neutral descriptions of a product line or service, and (4) brand and trade names and product or service listings."
Personally I'm fond of the test that my colleague at SUNY Brockport's station once described to me: when in doubt, take the language in the spot and substitute antonyms for everything you can. If the spot suddenly makes no sense at all, that means the language was promotional and you need to re-work it. Granted, a LOT of stations' underwriting routinely fails this test and the FCC doesn't seem to mind much. But YMMV.