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From Stefan Bodewig <>
Subject Re: [COMPRESS] pkware header id for crypto extensions
Date Thu, 03 Sep 2015 04:02:07 GMT
On 2015-09-02, Bear Giles wrote:

> Hi, I know that the implementation of the PKWARE AES crypto is subject to
> license restrictions but is it possible to recognize the extension fields
> so anyone scanning an unfamiliar file will at least know what the extra
> field headers contain?

I don't think this would be considered anything close to implementing
PKWARE strong encryption, so don't sense any legal problem here.

> I don't know if code to parse the contents (solely using the standard JCE)
> would trigger export restrictions. This would NOT be decrypting the data,
> just adding a thin layer of code to parse a standardized ASN.1 object.

Commons Compress has already got AES support for 7zip so we've filed the
necessary papers and there already are the necessary disclaimers in;a=blob;f=README.txt;h=b743b64210c5d550962e8b88322af24d351aa08f;hb=HEAD#l22


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