I have many items to upload, they use some tween classes that are available to free download and free use, (Zeh Fernando, author of the famous MC Tween) says, for example:

“Anyone can use it freely on their own work, be it open-source, free, or commercial work. While I do not enforce it, I do ask for credit where credit’s due – use common sense and don’t be a leech. ”

Also he include into the MC Tween, the Robert Penner´s equations (i know everybody know this too)

Here is the entire disclaimer & copyright link to this:
http://hosted.zeh.com.br/mctween/author.html

So, if i provide the origial source url, i make clear the class i´m using is not mine in help and comments, can i include the .as file/s into the zip file to make easy for the posible buyier to customize? I know the most of the buyiers don´t like the idea to download something else to make the file work. Is not the case for people with some actionscript knoweldge, but i´m sure the most of the buyiers are not in that cases.

So, if someone, with more knoweldge in this, can give an answer about this, would be great.

Thanks a lot.