A digital signature on a media release form can be legally binding, but only when the proper conditions are met. The specific requirements for a legally binding digital signature varies depending on the jurisdiction. However, in general, the signature should be verifiable, attached to the relevant document, and indicate the signer's consent, comprehension, and intent. While digital signature technology has evolved to provide secure and legally recognized methods of obtaining consent and agreement electronically, it is not yet universally accepted, so be sure to check the local laws before allowing your subjects to e-sign.