A copyright is a set of legal rights that authors have over their work for a limited period of time.
Copyright protects the expression of an idea rather than the idea itself. It does not matter whether a poem is written on a napkin, saved on a computer hard-drive or engraved on a wooden plank, all formats are considered expressions and are protected by copyright, including objects on the Internet.
The author of a work is usually the copyright owner. Only the copyright owner has the right to reproduce, perform or publish a work.
Works in the public domain are not protected by copyright and can be copied freely.
Fair Dealing is a user right in the Canadian Copyright Act. Fair Dealing involves making a single copy of an entire work, or a substantial part thereof, for the purpose of:
If you are unsure if your use of the work constitutes Fair Dealing, err on the side of caution and obtain copyright permission.
"Creative Commons is a nonprofit organization that increases sharing and improves collaboration."
You can use their Creative Commons Search to help you find licensed works that you can share, remix, or reuse.