license for software without source code

Ku2_BiO_X — Fri, 25 Jan 2013 04:33:08 +0800

hello

i have a software i write by myself and i want to release it but i don' t want to release the source code
i look around and usually ppl use GNU GPL license
so, what should i use for this software?

p/s: i also use another external software released under GNU GPL license, what about the license for that software?

thank you

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license for software without source code