The Abundance theme is available in two license variants, Single User and Developer

Single User

[YES] Can be edited, including footer links
[YES] Can be used on all websites which you personally own
[NO] Can be sold as part of a website package.
[NO] Can be offered as a bonus or packaged with other products
[NO] Can be added to membership sites
[NO] Can be re-sold as a standalone WordPress theme
[NO] Can be given away
[NO] Can sell Resale Rights
[NO] Can sell Master Resale Rights
[NO] Can sell Private Label Rights
[NO] Can claim authorship and copyright

Under the terms of this licence, you may not resell the Abundance theme under any circumstances. If you wish to sell your website while including the Abundance theme, you will either need to purchase a copy of the theme with a developer licence or your buyer will need to purchase a copy of the theme with a single user licence.

Developer

[YES] Can be edited, including footer links
[YES] Can be used on all websites which you personally own
[YES] Can be sold as part of a website package.
[NO] Can be offered as a bonus or packaged with other products
[NO] Can be added to membership sites
[NO] Can be re-sold as a standalone WordPress theme
[NO] Can be given away
[NO] Can sell Resale Rights
[NO] Can sell Master Resale Rights
[NO] Can sell Private Label Rights
[NO] Can claim authorship and copyright