{"id":"image-vnd-sealed-png","mimeType":"image/vnd.sealed.png","name":"SealedMedia Portable Network Graphics","shortName":"Sealed-PNG","category":"Security \u0026 DRM","extensions":[".spng",".sealed-png"],"description":"The image/vnd.sealed.png MIME type represents a Portable Network Graphics (PNG) file that has been encrypted and wrapped in a proprietary Digital Rights Management (DRM) container by SealedMedia (later acquired and rebranded as Oracle Information Rights Management or Oracle IRM). This format was utilized in enterprise environments to strictly control document access, track usage, and revoke viewing privileges of sensitive images even after they were downloaded by the user or distributed outside the corporate network.","seo":{"title":"image/vnd.sealed.png MIME Type | Developer Reference for SealedMedia","description":"Complete reference for the image/vnd.sealed.png MIME type: SealedMedia DRM, Oracle IRM history, encrypted image payloads, and enterprise file security.","faqs":[{"question":"What is a sealed PNG (.spng) file?","answer":"A sealed PNG file is a standard PNG image that has been encrypted and encapsulated within a proprietary DRM (Digital Rights Management) shell developed by SealedMedia. It requires specialized software and authentication against an enterprise licensing server to open."},{"question":"How do I open an image/vnd.sealed.png file?","answer":"You cannot open a sealed PNG with standard image viewers or web browsers. You must install the Oracle IRM Desktop client (or legacy SealedMedia Unsealer) and possess the active credentials and permissions granted by the document owner's central licensing server."},{"question":"Can I convert a sealed PNG to a normal PNG?","answer":"Not directly. The file is cryptographically secured. You must first open it using the authenticated Oracle IRM client. If your permissions allow it, you may be able to copy the image or use the 'unseal' feature to export it back to an unprotected PNG format."}]},"index":{"compression":["Encrypted Payload (Deflate)"],"browserSupport":{"score":1,"label":"None"},"commonUses":["Enterprise Information Rights Management (IRM)","Secure Corporate Intellectual Property Distribution","Revocable Medical or Legal Imaging"]},"technical":{"magicBytes":{"hex":"Unknown (Proprietary SealedMedia Container)","ascii":"Unknown"},"container":"SealedMedia / Oracle IRM Wrapper","compressionAlgorithm":["AES Encryption","Deflate (Internal PNG payload)"],"colorDepth":["Encrypted Payload"],"transparency":false,"animation":false,"metadata":{"exif":false,"xmp":false,"iccProfile":false},"alphaChannel":false,"progressiveLoading":false,"hdrSupport":false},"history":{"developer":"SealedMedia (Acquired by Oracle Corporation)","released":"Late 1990s / Early 2000s","specification":"Proprietary (Registered with IANA in 2007)"},"browserSupport":{"chrome":false,"chromeVersion":"None","firefox":false,"firefoxVersion":"None","safari":false,"safariVersion":"None","edge":false,"edgeVersion":"None","internetExplorer":false},"softwareSupport":[{"name":"Oracle IRM Desktop","logo":""},{"name":"SealedMedia Unsealer (Legacy)","logo":""}],"conversion":{"convertTo":["png"],"convertFrom":[]},"developer":{"httpHeaders":[{"header":"Content-Type","value":"image/vnd.sealed.png"}],"htmlAccept":"None","fileDetection":["Standard file sniffers lack magic byte definitions for the proprietary Oracle IRM/SealedMedia container wrapper.","Identification relies almost entirely on the .spng extension or HTTP Content-Type headers generated by the IRM distribution server."]},"prosCons":{"pros":["Provided absolute control over intellectual property, allowing enterprise administrators to instantly revoke viewing rights of a local file globally","Detailed audit trails tracked exactly who opened the image, when, and from what IP address"],"cons":["Completely proprietary and relies on a central authentication server; if the server goes offline, the image is permanently inaccessible","No support in modern operating systems, web browsers, or standard image editing software without installing heavy enterprise DRM clients","Oracle effectively deprecated the IRM product line, leaving legacy sealed documents difficult to recover"]},"specifications":{"url":"https://www.iana.org/assignments/media-types/image/vnd.sealed.png","rfc":"","mimeAliases":["application/vnd.sealedmedia.softseal.png"]},"developerSnippets":{"python":"import magic\n# Libmagic lacks definitions for the proprietary SealedMedia container. It will likely identify the file as 'application/octet-stream'.\nprint(magic.from_file('secure_image.spng', mime=True))","nodejs":"const mime = require('mime');\n// JS MIME libraries map .spng to image/vnd.sealed.png purely based on historical IANA registry associations\nconsole.log(mime.getType('secure_image.spng')); // Likely outputs 'image/vnd.sealed.png'","go":"import \"net/http\"\n// The standard net/http library cannot detect sealed files internally via byte sniffing. You must rely on extension string matching.","php":"$mime = mime_content_type('secure_image.spng');\necho $mime; // Standard server environments will map this to application/octet-stream"},"relatedFormats":["png","vnd.sealed.gif","vnd.sealed.jpeg"]}