GPL-Style License w/ A Twist?

txsable asks: "I'm trying to find out if there is a GPL-style Open-source license available with a special twist: that any modifications made, while being allowed to be released as per the terms of the 'normal' GPL, must also be submitted back to the original author for possible inclusion in the main project. I know it seems ridiculous to require by license what should be a common-sense procedure for open-source developers, but I've seen enough projects which were greatly modified from the original project, with features the original project either was working on or had also developed, and it led to confusion and/or unnecessary duplication of effort. Anyone have any suggestions for me (other than writing my own license...I don't speak enough lawyer to make something that reads as bad as a legal document)?"

Clarification

[Lish]

Do you mean:
"If you modify this code, you must submit changes back to the original author"
or:
"If you modify this code and release the modified code for public use, you must release the modified source to the public and submit changes directly to the original author"

Basically, does someone have to send you changes they made if they are not releasing the modified code in general? I am not clear from the wording you used.

Re:Bad Idea.

[rjh]

If software were truely free, you'd be able to do what you wanted and not have to do a damn thing in return. This SHOULD include being able to do what ever you want with the source, including selling a hacked up commercial version without opening your source if you don't want to.

Hmm. Let's try rewriting that as,

If America was truely free, you'd be able to do what you wanted and not have to do a damn thing in return. This SHOULD include being able to do what ever you want with your life, including selling children into preschool prostitution rings if you want to.

Freedom does not mean ``you can do whatever the hell you want''. That's called anarchy, and while some people would call anarchy perfect freedom, I don't--I call it a damn dangerous place to live. Freedom carries with it responsibilities, the foremost of which is not to infringe upon other people's equal freedoms. My freedom of speech carries with it the responsibility not to use my speech to limit your freedom of speech.

Free Software, in the FSF's view, needs to carry with it the responsibility that it not be used to deny other people software freedoms.

Don't like it? Hey, that's fine--not as if you needed anyone's permission to not like it. But please don't call it unreasonable simply because inherent in the GPL is the notion that you must not deny these freedoms to anybody else.