Use of Sound/Music
It is strictly prohibited to use created by third parties without obtaining the respective rights of use. Solely the use of music for teaching purposes is permitted in accordance with applicable copyright law.
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Fortunately, there are ways to protect the copyrights of your own works even without extensive prior knowledge in terms of licensing. There are organizations that are specialized in helping creatives like us with licensing issues. One of the largest of these organizations is Creative Commons (CC), an American non-profit organization devoted to expanding the range of creative works available for others to build upon legally and to share. The organization has released several copyright-licenses known as Creative Commons licenses free of charge to the public. These licenses allow creators to communicate which rights they reserve, and which rights they waive for the benefit of recipients or other creators. An easy-to-understand one-page explanation of rights, with associated visual symbols, explains the specifics of each Creative Commons license. [Wikipedia]
Short explanation video:
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Copyleft
Copyleft (a play on the word copyright) is the practice of offering people the right to freely distribute copies and modified versions of a work with the stipulation that the same rights be preserved in derivative works down the line. Copyleft software licenses are considered protective or reciprocal, as contrasted with permissive free software licenses. Copyleft is a form of licensing, and can be used to maintain copyright conditions for works ranging from computer software, to documents, to art, to scientific discoveries and instruments in medicine. [Wikipedia]
give a brief overview of possibilities, esp open source licencing, free software-type, "copyleft" and creative commons, with links, etc