Sometimes it is good to have a reality check, and remember exactly what your rights are as a Flash developer.

As a Flash developer, people will try to take advantage of you. Don't let them! Remember that people causing problems with your Flash file are your problem as well, and you need to protect your rights.

Regardless of what website your SWF is on, it is your property.
Websites are not allowed to claim your project as anything else beyond what you claim it. Some websites feel that your project is public domain because it can be found there. That is not the case!

You are allowed to reject websites from hosting your file.
A Flash website may make the case that everyone else is hosting their file, and so should they. If there is a website you don't want your content on, don't let them.

Your Flash Sponsor should allow you to keep your name on it.
Your work is your work. If you are merely getting your Flash sponsored, ask to keep your name on the file. Sure, your sponsor will wants links on, but they shouldn't take full control of your file. Unless you are working directly for them under the agreement that your work is the company's work, try to hold on to your credibility. Or find another sponsor who will.

If they won't listen, take action!
Terrible game websites may need a bit more prodding. If they are decompiling your file or using your file without permission and being rude to you, do something about it! By threatening them with legal action or Cease and Desist orders, you might get to them a bit more than just sending casual emails. For more information, check out the Dealing with Flash Sites section. Remember, anything they get away with with you will also be dealt to other Flash developers.

Keep your Source Safe
Your source code is your life and blood. From your source comes your code, graphics, and editable content from your project. If you give it away, make sure you are giving it away to be copied and edited. Just letting people borrow a section? Send them the portion, not the whole file. You never know where your file will end up!