Post script fonts, first ad. please help

Hi,
I’m doing my first ad that’s actually going to be published and the guidelines say “Use post script fonts only to avoid type disappearing from ads. No open-type fonts or trueType fonts should be used.” I’ve only done ad’s and flyers for friends so I’m not sure how I can tell if a font is Postscript. I have a mac and I just used the fonts in my library usually. Today I got a whole bunch of Truetype fonts before I read the guidelines though :-(. Anyway, Could someone help me? How do I know a font is post script? Will I have to get a bunch of new fonts? I read what a post script font is but I don’t know if I already own them or how to tell. Please help. This is important to me since it’s my first ad.

Thank you :slight_smile:
Holly