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You could losslessly translate PDFs with compression to PDFs with no compression (bitmap images excepted), tar them up and compress the lot. This would get you
by ectopod 5y ago
You could losslessly translate PDFs with compression to PDFs with no compression (bitmap images excepted), tar them up and compress the lot. This would get you a fair bit of gain for little pain.
However, I guess they use .zip STORE because it's fairly robust against minor corruption.