You can legally copy protected works when you are the copyright owner, or you have permission from the copyright holder or an exemption in the law. The most commonly cited exception is fair use or fair dealing, which is intended to allow certain limited uses in cases such as education and critique; fair use is exceptionally (and intentionally) vague, and should be relied on sparingly.
It is okay to write a book on something that is copyrighted, but you cannot publish your work unless you get permission from the author.
yes
no its not okay its probably annoying to him and he/she should do there own thing and find something to do that your friend have not done
It's okay when the rightsholder or the law says it's okay. Different rightsholders have different opinions, and what they say goes.
Unless it would fall under "fair use" no it is not "okay" to use copyrighted material without permission
no
It is okay for a student to copy things they find online as long as they either have permission from the author or use only short excerpts that they cite. You cannot just copy everything you find, online or otherwise, and pass it off as your own work. It is best to read up on copyright law.
Yes it is okay to make a carbon copy of a bill of sale. You should make a carbon copy of the bill just to have more then one form of documentation of the bill.
Legally no...but everyone, i mean EVERYONE does it.
It is best to copy and paste, put the information in your own words and then delete the original. That's what I do.
They aren't "self deleting" youtube deletes them for you because of violations or copyright laws. try uploading something that is your own material dont steal or copy videos if you have permission to upload that or add a copy right plate then its okay
If you know for certain that the music is not copyrighted, you can add it to your site. Do not automatically assume that it is okay to add original music that is found on another site to your site, though. It's best to contact the site owner to ask permission to use their original work, even if you do not think the music is copyrighted.