Choose a license
choosealicense.com
choosealicense.com
What about the liability? The moral rights? The second creation's right? The endorsement clause?
Picking up a license on a website that does not even point to any clear definition of license and why we need them is disinformation.
Even the FSF I love to criticize has a better page that is more informative and complete :
http://www.gnu.org/licenses/license-list.en.html
Of course it requires to read, but choosing a license is an important choice.
And proprietary licenses are fine if they fit your needs.
I think the answer to the question is a type of creative commons license (I looked it up once but didn't commit to memory) -- would love to see that answer here
It seems like the more likely solution is to just not do open source, or do open source and add some value (support/custom extensions/etc)
A question you should consider is why you want to charge for the use of your software. Many companies are happy to pay for licenses, where you can just sell them an identical copy of your software. In addition, you can provide support for your software (adding features, fixing bugs).
If companies work to maximize profit and minimize costs, I wouldn't bet on them wanting to pay for a license just to have an identical copy of the software (with no value add). I also realize that I can provide that value-add with support -- thanks for pointing that out, it's definitely something to consider.
None of them stop forks, of course.