The Startup License is simple.
Use Startup for multiple projects, both personal and commercial.
But there are some things you can't do:

Use Startup or source files for website/app generators.
Redistribute or resell Startup or source files.
Offer Startup to users of your hosting or blogging service.
Create Templates, Themes and Plugins for sale or free distribution.
If you cannot find the answer to your question, we'll be happy to help.
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