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: cant unlock memory card
The little slide switch may be broken inside the card. Do you have another card to try in the camera? If another card does work in the camera, then it's time to buy a new card. They're inexpensive these days anyways at about $6 for 2GB:
https://www.amazon.com/s/ref=nb_ss_?url=search-alias%3Delectronics&field-keywords=sd+card+2gb
SOURCE: card locked
If this happened after the card had been removed then you may have inadvertently slide the card lock into the 'lock' position. If the card has not been disturbed, the very fragile 'switch' may be defective. I would try removing the card and operating the slide-lock several times and then leaving it in the unlocked position.
SOURCE: Memory card is locked for
There are several possible causes for "memory card locked", "memory card error", or "no memory card". Some include trying to use of a 4GB SDHC card with an older camera made before SDHC format came out. Others include problems with the switch on the side of the card, or the switch internal to the camera. The problem may also arise from simple formatting problems if the card has never been formatted in the camera (note that this will also erase the card). Troubleshooting tips for this problem may be found at this link.
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