You can get the free flex licence if you meet the following criteria..
- Using Flex in a non-commercial and non-institutional manner., Non-commercial use means that that the software may not be used on any web site or application that sells, advertises, or otherwise promotes revenue-bearing products or services of any kind. non-institutional use means that the software may not be used for any web site or application that facilitates the operation of any institution, including but not limited to corporations, partnerships, sole proprietorships, governments, or educational institutions.
- Educators or students looking to learn or teach Flex.
- Bloggers who want to showcase Flex applications on their personal blog.
Want to know more? Go to http://www.macromedia.com/software/flex/productinfo/faq/#ancni