假如我找到GPLV3授權的軟體，更改之後，一樣以GPLV3的模式釋出，
問題一：
我可以發佈在android market收費嗎？
因為我看到一個案例
market.android.com/details?id=com.yuandroid.touchPTTDonate
他是修改別人的軟體然後使用gplv3，然後收費

問題二：
假如修改後的軟體，一樣上傳到android market，改為免費下載，一樣版權採用GPLV3，但是我有加入admob廣告，來獲得收入，可以嗎？
因為程式要加入admob的jar，admob的原始碼是沒有公開的，我讀了GPLV3的英文版，看的不是很懂，www.gnu.org/licenses/gpl-faq.html#GPLIncompatibleLibs
裡面GPL-incompatible libraries with GPL software的原則，
Additional permission under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or combining it with [name of library] (or a modified version of that library), containing parts covered by the terms of [name of library's license], the licensors of this Program grant you additional permission to convey the resulting work. {Corresponding Source for a non-source form of such a combination shall include the source code for the parts of [name of library] used as well as that of the covered work.}
我也不確定加入admob後，符不符合gplv3的原則

問題三
我有大概看了一下apache2.0及LGPL授權模式
假如問題還是如問題二，授權模式換成apache2.0及LGPL，不知可以嗎