Maryland Code, Estates and Trusts § 4-203

(1) The testator, on demand of the testator;

(2) A court appointed guardian of the testator's property, on demand of the guardian; or

(3) An attorney in fact acting under a durable power of attorney signed by the testator expressly authorizing the attorney in fact to demand custody of the will, on demand of the attorney in fact.

(b)(1) After the death of a testator, a person having custody of the testator's will shall deliver the will to the register for the county in which administration should be had pursuant to § 5-103 of this article.

(2) The custodian may inform an interested person of the contents of the will.