How do I erase "protected"

Use the menu to unprotect the image then you can delete. Also you can format the card but that will remove all the images on the card so make sure you've saved it elsewhere.

SD and Micro SD memory cards has a smallslide switch on the edge of the card, which write protects data on the memorycard. Slide the switch from the READ position tothe WRITE position, which is furthest away from the contacts.

Press the MENU button, select the Playback tab (right-pointing arrow), select [Protect], and press the FUNC/SET button.

Full details are in the "Protecting images" section of the manual (page 116 in my copy). If you need a manual, you can download a copy at
http://gdlp01.c-wss.com/gds/4/0300002064/02/PSSD780IS_IXUS100IS_CUG_EN_02.pdf

Go to Canon PowerShot SD1300 IS: Playback Mode Menu
And there you have : Protect
Unselect your pfoto!

The date stamp on the existing images can't be moved by the camera You can move them on computer by some software as PS

You will need to first unprotect the image and then you can delete it.

It sounds like the locking switch on the side of the SD card is in the "locked" position. Remove the card from the camera and slide the tiny switch on the card to the unlocked position. That should do it.

On page 22 of your user manual it talks about protecting images. Looks like you go to playback menu use the arrow keys to select the locked image - then press up or down arrow to remove the key symbol fromt he image by selecting ON or OFF.

If the image has a small icon of a skeleton key along the bottom when viewing it, it means the image has been protected. You have to un-protect the image to erase it. This is done from the Playback Menu (the one with the arrow on the tab). Specific instructions are on page 115 in the manual. (Manual is available here if you don't have it.)

Image protection and erasing are covered on pages 64 and 65 of the manual (you can view/download the manual here). If you are going to erase all images, you can just initialize the card (see page 65). It will erase all images, even protected ones.