SignProof Pro - Version 1.0 By Sign Makers FOR SignMakers. SignProof Pro uses a highly encrypted format which embeds the image file (at 500 pixels on the long side) along with the company's copyright and contact information. This data is not accessible on the users machine at any point, as it's extracted directly into RAM where it is decrypted for direct viewing by our software. AND, the SignProof Pro technology prevents most screen capture.