Free webp to jpg
EN
Image MIME Reference
Sealed-PNG

SealedMedia Portable Network Graphics

image/vnd.sealed.png
VS

Tencent TAP Image

image/vnd.tencent.tap
Tencent-TAP

A complete technical comparison of SealedMedia Portable Network Graphics and Tencent TAP Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature Sealed-PNG Tencent-TAP
Transparency (Alpha) ✕ No ✕ No
Animation Support ✕ No ✕ No
Progressive Loading ✕ No ✕ No
HDR Support ✕ No ✕ No
EXIF Metadata ✕ No ✕ No
ICC Color Profile ✕ No ✕ No
SealedMedia Portable Network Graphics
image/vnd.sealed.png
Extension
.spng.sealed-png
Container SealedMedia / Oracle IRM Wrapper
Compression Encrypted Payload (Deflate)
Algorithm
AES EncryptionDeflate (Internal PNG payload)
Color Depth Encrypted Payload
Developed by SealedMedia (Acquired by Oracle Corporation)
Released Late 1990s / Early 2000s
Magic Bytes
Unknown (Proprietary SealedMedia Container)
Full Sealed-PNG reference →
Tencent TAP Image
image/vnd.tencent.tap
Extension
.tap
Container Proprietary Tencent Container
Compression Unknown (Proprietary)
Algorithm
Unknown
Color Depth Unknown
Developed by Tencent (Registered by Ni Hui)
Released 2014
Magic Bytes
Unknown (Proprietary)
Full Tencent-TAP reference →

Browser Support Comparison

Browser Sealed-PNG Tencent-TAP
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
Sealed-PNG

Sealed-PNG Strengths

  • 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
Limitations
  • 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
Tencent-TAP

Tencent-TAP Strengths

  • Officially registered with IANA, ensuring a unique MIME type identifier for internal Tencent network routing and content negotiation
Limitations
  • Completely undocumented and closed-source, making it impossible to decode or parse outside of Tencent's software
  • Shares its file extension (.tap) with numerous other established legacy formats, leading to frequent automated file misidentification by Node/Python libraries

When to choose which format

Sealed-PNG
Use Sealed-PNG when…
  • Enterprise Information Rights Management (IRM)
  • Secure Corporate Intellectual Property Distribution
  • Revocable Medical or Legal Imaging
Tencent-TAP
Use Tencent-TAP when…
  • Internal Tencent Ecosystem Applications
  • Proprietary Mobile or Gaming Assets

More comparisons

Sealed-PNG vs ACES → Tencent-TAP vs ACES → Sealed-PNG vs APNG → Tencent-TAP vs APNG → Sealed-PNG vs AVCI → Tencent-TAP vs AVCI → Sealed-PNG vs AVCS → Tencent-TAP vs AVCS → Sealed-PNG vs AVIF → Tencent-TAP vs AVIF → All comparisons →
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