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This is a watermark for PUPs. For development PUPs, the Issue ID is unique to the company/organization the PUP is issued to.

Offset Size Description
0x0 0x8 Magic
0x8 0x4 Unknown
0xC 0x4 File Size
0x10 0x4 Issue ID
0x14 0x4 Unknown
0x18 0x4 Unknown
0x1C 0x4 Unknown

The Issue ID for SCE/retail PUPs seems to be 0x5A. The file appears to be signed twice. The first signature is the same for different issue ids. The second signature is unique.