This invention relates to a method permanently write protecting a portion of a memory card. According to the invention a bit indicating permanent write protection or permanent write protection of a portion of the memory card is set in the specific data register of the memory card to indicate that all the write protect groups protected with write protecting command are permanently write protected. In another embodiments of the invention special commands are used to control the write protection of the portion of the memory card. This invention also relates to a partially permanently write protected memory card. The invention further relates to an electronic device, a software, a system and a module utilizing the method of the invention.