Yes, any document that has the fonts embedded or burned in (like with video) can be still used. You won't be able to change the document, however.
So to both of your questions, the answer is YES.
However, should you use fonts on your website, they will need a continued subscription. They are not embedded.
See the licensing terms for more information: https://helpx.adobe.com/fonts/using/font-licensing.html
(Disclaimer: As always with licensing, this is my interpretation of the rules. I think they are correct and advice is based on reading and interpreting the licence terms and on fair use for both the buyer and the artist/company, but I cannot rule out that my interpretation is wrong. I'm not an Adobe employee).
ABAMBO | Hard- and Software Engineer | Photographer