So, I decided to take a look. It used to be that Flash's terms forbade you from ever working on a competing Flash implementation.
English is on page 87: http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/e...
Heh, it might be forbidden to spin it up in cloud VMs, though local VMs are okay as long as you don't run nginx on your laptop? "3.2 Server Use. This agreement does not permit you to install or Use the Software on a computer file
server." "4.1 Adobe Runtime Restrictions. You will not Use any Adobe Runtime on any non-PC device or with any
embedded or device version of any operating system" ...
This provision is really broad: "9.5 Indemnity. You agree to hold Adobe and any applicable Certification Authority (except as expressly provided in its terms and conditions) harmless from any and all liabilities, losses, actions, damages, or claims (including all reasonable expenses, costs, and attorneys fees) arising out of or relating to any use of, or reliance on, by you or any third party that receives a document from you with a digital certificate,
any service of such authority ..."
If you are acting on behalf of a business, you might not want to authorize Adobe to occupy your business's time telling them your business secrets: "15. Compliance with Licenses.
If you are a business or organization, you agree that upon request from Adobe or Adobe’s authorized representative, you will, within thirty (30) days, fully document and certify that use of any and all Software at the time of the request is in conformity with your valid licenses from Adobe."
I'm not sure whether this persists: "4.5 No Modification or Reverse Engineering. You shall not modify, adapt, translate, or create derivative works based upon the Software. You shall not reverse engineer, decompile, disassemble, or otherwise attempt to discover the source code of the Software.", where "“Software” means (a) all of the contents of the files (delivered electronically or on physical media), or disk(s) or other media with which this agreement is provided". I'm not sure whether "Software" includes bit-for-bit identical copies of the software obtained by other means at other times (see http://ansuz.sooke.bc.ca/entry/23 ).