Salaam...Ramadan...Question Regarding Copyright?

Technically everything online is copyrighted even your own words here just proving it is near impossible. Many people believe that because something is online it's not copyrighted and free to use. Many images have gone through so many websites that rarely are the ones hosting the photo the actual holders of copyright. The website is trying to enforce their copyright by blocking right click. If the slideshow is for your personal use on your computer, it is acceptable to have them. If you post the show online the copyright holders of the pictures do have the right to ask you to take it down. What you cannot do is make a profit or benefit in some way from those photos since you did not take them. Playing on the safe side would be to ask for permission from the site you too the photos from with the understanding that they may not be the actual holders of copyright.