What is the
license about?
The Creative Commons copyright licenses and tools forge a balance
inside the traditional “all rights reserved” setting that copyright
law creates. Their tools give everyone from individual creators to
large companies and institutions a simple, standardized way to
grant copyright permissions to their creative work. The combination
of their tools and their users is avast and
growing digital commons, a pool of content that can
be copied,
distributed, edited, remixed, and built upon, all within the
boundaries of copyright law.
Types of
licenses.
1. 
Attribution "CC
BY"
This license lets others distribute, remix, tweak, and build upon
your work, even commercially, as long as they credit you for the
original creation. This is the most accommodating of licenses
offered. Recommended for maximum dissemination and use of licensed
materials.
2. 
Attribution
"CC-BY-ND"
This license allows for redistribution, commercial and
non-commercial, as long as it is passed along unchanged and in
whole, with credit to you.
3. 
Attribution
"CC-BY-NC-SA"
This license lets others remix, tweak, and build upon your work
non-commercially, as long as they credit you and license their new
creations under the identical terms.
4. 
Attribution
"CC-BY-SA" (Most popular in sgForums Buses)
This license lets others remix, tweak, and build upon your work
even for commercial purposes, as long as they credit you and
license their new creations under the identical terms. This license
is often compared to “copyleft” free and open source software
licenses. All new works based on yours will carry the same license,
so any derivatives will also allow commercial use. This is the
license used by Wikipedia, and is recommended for materials that
would benefit from incorporating content from Wikipedia and
similarly licensed projects.
5. 
Attribution
"CC-BY-NC"
This license lets others remix, tweak, and build upon your work
non-commercially, and although their new works must also
acknowledge you and be non-commercial, they don’t have to license
their derivative works on the same terms.
6. 
Attribution
"CC-BY-NC-ND"
This license is the most restrictive of their six main licenses,
only allowing others to download your works and share them with
others as long as they credit you, but they can’t change them in
any way or use them commercially.
How to insert
the license into your work?
If it is an online work in websites or offline work (eg.
photos), please visit here and follow the
instructions.
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If you don't know which license to choose, click here.
Information is from Creative Commons webpage.