1.) Do you know where the images and music on your site came from?
2.) Do you know who the original artist, composer or sequencer is ?
3.) Is the artist, composer  or sequencer given credit on your site?
4.) Do you give credit for any images used that are not your own, on the pages where the work is used as many artists ask?  (See: What is so bad about credit pages?) 
5.) If you offer images and music on your site, is the work your own?
6.) If the work being offered to others on your site is NOT YOUR OWN, are you offering it with the permission of the person that originally created it?
7.) If you have created images for your site, with the aid of other images, do you know where those other images really came from?
8.) If you know where the images came from, have you gotten permission from the original creator before altering them.
9.) Are all the images, and midis being used by you, housed on your own site? In other words are you using only your own bandwidth? ( See What is bandwidth and what is meant by Bandwidth theft ? )
10.) If you are a graphic designer who uses graphic aids such as clipart,  tubes, brushes and dingbats in your creations, have you made certain that the clipart,  tubes, brushes and dingbats contain only original material originally created by the person that is offering these aids? (not someone else's clipart or scans from books, calendars, or greeting cards etc). 
If your need a further explanation to #10 please see. Sites Bearing Stolen Gifts.(tubes, brushes and dingbat fonts)

If any of your answers to the questions listed above were NO. Then your site is probably infringing on someone's copyrights.

HAVE YOU SEEN THIS STATEMENTS?
" I have collected these images or this music from all over the web for your enjoyment and I believe all to be public domain. If you find your copyrighted work here and wish it removed just E-mail me, and I will do so." 

Statements such as this should give you a clue, that
1.) the webmaster, did not create the images or music,
2.) does not know who did, or
3.) whether the work is indeed public domain or not. 

Contrary to popular belief, very little on the net is public domain.
The sites that gathered other people's creative work from all over the web are the vultures of the internet. They feed on the creativity and generosity of our artists, musicians, sequencers and Java scriptors. They have nothing original or creative to offer themselves, so they visit our sites and abuse our kindness, by stealing our work and then claiming it is public domain.

TAKING RESPONSIBILITY for your own site
Giving away something without knowing where it came from is irresponsible and dishonest. Pleading ignorance of anything has always been a lame excuse, and statements such as the one above do not absolve the guilty parties. It is not fair to ask an artist or musician to come find their work on such sites before it will be respected. The problem these sites create does not go away when the work is removed. How many others that visit such a collection site, will be lead to believe that the work is public domain before the work is removed, and will themselves give it away in their own collections. When someone uses material from such a site, and the work turns out to be copyrighted, then that person is just as guilty of copyright infringement as the site that offered it to them. The best way to protect yourself against this type of thing is to take responsibility for what you choose to put on your own web pages. If you don't know where something originally came from, then DO NOT USE IT. Make yourself aware and help make the web a better place for all of us.

More copyright information from CS Designs: 
What is so bad about credit pages?
Sites Bearing Stolen Gifts (brushed, tubes and dingbat fonts)
What is bandwidth and what is meant by Bandwidth theft ?
Letter draft to send to someone found using your graphics without proper credit
Letter draft to send to some one found using your personal images or giving them away in a collection
 

More copyright information other sites:
10 Big Myths about copyright
Law of the Internet
Library of Congress US Copyright Office
US Copyright Office FAQ
US Patent and Trademark Office:
Google Digital Millennium Copyright Act / Google Blogspot
Yahoo UK! Copyright and Intellectual Property Infringement Complaint Form
Yahoo Us Copyright and Intellectual Property Policy

FortuneCity Copyright Policy

WordPress.com Copyright Policy