it was WORK to read and understand the code and adapt it to my code/or adapt mine to theirs.
i would maybe attribute it IF AND ONLY IF it is WORTHY/BRILLIANT/INGENIOUS … anything else its just the short cut to the code i would have written. i dont waste my time on licenses longer than 40 lines. SUE ME.

GPL? For real? literary GPL view: if you would write a book and cite something in it, not only reference (link) but cite it !! if GPL was on that source you would have to give away your book for free (except the physical medium, paper) and make sure anyone receives it.

Man, think of it as if you’re writing a book and you’re citing someone.
every line you write yourself is obviously yours, its your human right: you are not their slave! Just because they were to lazy (or worse) to implement that feature doesn’t mean they can force you to unlock YOUR CODE.
Their code, still is open … at their place !!

I maybe should add that i don’t like closed source code and during my spare time i usually code open source, with an own short (LT30lines) attribution & fair share license and i encourage everyone to do the same who ever writes open source.

if you make you’re code open you want that you’re code is read, understood, modified, made better and shared …. but do you really want those that think they can use it on a commercial product not to attribute you and if it works out give you money? really?
you have nothing to loose but everything to gain!! ditch GPL and arrive on a FAIR new DAWN!!

this are my 2 cents to this subject. you may cite this and spread the word freely!!

selfless
you can modify and do whatever you can do the code
(you can even say you wrote the code without adding credits to the original source)

public domain
no license

slightly selfish
(you can modify and use it however you want but you need to provide credits)
bsd and similar

selfish
(pay related licenses)
(licenses that require you to inhere to their terms and more conditions other then to provide credits to use their code)
(licenses that require you to share back code and credit sources)*if you distribute it

gplv2
pay related licenses

more selfish
(licenses that require you to open code back to users if you are providing cloud services)
gplv3

most selfish
(codes that you have no source over)

BSD license users tend to want people to use the code. When OpenBSD code goes into Windows, BSD coders don’t complain. When FreeBSD code makes its way into Mac OS X, FreeBSD developer’s don’t get offended and Apple even gives back. BSD license users want the code out there in any way it helps. They are socialist whiners like Stallman. The end.