I don't want to modify it, and the script itself has URLs to their site in the header. They have a commercial version for sale, but I want to know when I should pay for it. Here's the GPL-3.0 license.
Do I need to provide a download link of the software on my site?
Or a link to their site?
Or just the license?
- Do I need to offer the source of my site as GPL-3.0 also?
- Can I use it if my site is for a for-profit business?
- What's the tipping point for needing to purchase a commercial license?