Topic: modify and distribute the software rights
proprietary software gives the user to copy, windows 7 key study, modify and distribute the software rights, windows 7 key and provide the source for the user is free to use windows 7 key, only to give some other restrictions insanity workout. Firefox and OpenOffice windows 7 key. Shareware: use its trial version is limited windows 7 key, but during the function or use cheap windows 7 key. Free Software windows 7 key: but does not provide the source code windows xp key, can not be modified insanity dvd. Public software windows 7 key the original author has abandoned the rights of copyright expired, discount windows 7 key or of non-sophisticated software.