Re: [projectvrm] Watermarking personal data

[Drummond Reed < >]

Doc, my apologies for being slow as I typically only get to check in on the list once a day. But I would not be worth of my OASIS XDI Technical Committee Co-Chair hat if I didn't point out that what you ask for is exactly what XDI link contracts do. They wrap the data (any data) with a machine-readable semantic description of the sharing rights. And link contracts can reference link contracts so they can be nested or chained as deep as you likeLinkedIn

Link contracts based on a common semantic graph model have many other wonderful properties too, but 'nuff said for now. A bunch of us from the XDI TC will be at IIW and be happy to dive into it further there.

On Tue, Oct 8, 2013 at 11:11 AM, Doc Searls < " target="_blank"> > wrote:

Thanks.

The question came up in a conversation, and I though I'd pass it along before I forgot it.

You're right that it depends on the kind of data, and also on the context.

Doc

On Oct 8, 2013, at 11:15 AM, Johannes Ernst < "> > wrote:

> If the personal data in question is an X-Ray, yes you can watermark it.
> If it is an avatar image, you possibly can. (it may be too small)
> If it is a phone number, you cannot.
>
> (Phone numbers, as an example for lots of personal data, do not have any redundancy, so you cannot use that to put your watermark there)
>
> For a full trail, you need the cooperation of the people sharing. In other words, the problem cannot be solved with technical means alone.
>
> Cheers,
>
>
> Johannes.
>
> On Oct 8, 2013, at 6:48, Doc Searls < "> > wrote:
>
>> Is there yet a way yet to watermark shared data, or to concatenate information about who is sharing it with whom — so if the data arrives at D, it carries evidence it was shared by A with B, who then shared it with C, who then shared it with D.
>>
>> Doc
>