SD cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.
SOURCE: canon power shot sx 100 reads card locked
SD Memory cards have a tiny switch on the edge that marks the memory card as read only and prevents any writes. If you get the message "Card locked!" when you turn the camera on then turn the camera off, eject the SD card. With the card facing you (metal contacts facing away) the switch is on the left hand edge, slide towards the top of the card to make the card read/write again.
SOURCE: My canon power shot camera says :card kocked: how
Remove the card, and look for a tiny slide switch on the side of the card. Slide this switch to the other "unlocked" position. Reinsert the card and try it out.
SOURCE: memory card capacity for my older canon digital camera
Does you camera use CF cards?
If so the may work but some of the newer high tech CF cards are made for newer cameras.
It may be worth a shot to try the 2GB card and if it does not work, sell to someone who uses those.
SOURCE: how to unclokc canon sd700 power shot memory card
Move the slide switch on the side of the card.
Testimonial: "it was very helpful i been trying to unlock it for week never new there be tiny button on card THANK YOU"
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