"?[numbers]" in pixiv source

Example: post #691638

The source for this post is http://img02.pixiv.net/img/mukr/11292192.jpg?1276555664. This somehow caused the dupe detector to fail, as it is a duplicate of post #689703, whose source is the same except it doesn't have "?1276555664". (A quick check shows that the MD5 hashes for both files are different.) In addition to possibly letting dupes through, it thwarts the source redirect, always making it http://www.pixiv.net/member_illust.php?mode=medium&illust_id= which of course leads to an error page.

Why does this happen? Is there something that can be done about it on an administrative level? Should I just remove the ?[numbers] from the URL whenever I see it? etc.

I would say yes, remove the ?[numbers] since they screw up the source redirect.

See forum #35759. You can search source:*pixiv.net/img/*?* to find more posts like this.

Magus said:
I would say yes, remove the ?[numbers] since they screw up the source redirect.

Don't do that, it makes the source point to the wrong image. The site just needs to be fixed to generate the link correctly. Trac #1199.

Looking at those images, it seems like it's a special feature available only to 'pixiv premium' members, which would be why many artists post new versions of their artwork as separate pictures instead.