Hi All
The policy is in place to ensure that ONLY content which is DEFINITELY uploaded without permission is removed. This policy is to protect both us, and the community. If we change this so that only 'suspicion' by the community is required to have content removed (which is what is being suggested...), then you open up the lovely can of worms of
any member being able to have
any content removed without due investigation (the investigation occurring after the content is removed). We will not do this, it is simple as that. As that is exactly what you have suggested (the system doesn't allow 'blocking' a download, only deleting it which is essentially permanent without installing an earlier backup; which can mean requiring creators to re-upload content removed when rolling back to the earlier backup). Instead, we perform the investigation before we remove the content. Remember, the content may or may not have originally come from the DLS, so we may or may not find a duplicate on the DLS.
There are a grand total of TWO parties who can DEFINITELY say that content has been uploaded without permission. The uploader, and the original creator. No one else can, for certain, say if the upload was with permission or not. Hence we require the original author to inform us of this.
Note, this does not include legal council, or transfer of ownership of the artwork/content. In this situation we may take this into account (this would be done on a case by case basis; legal council would be highly likely though

).
After the original author contacts us, there will be at most 3-4 days before we remove the content. This includes checking the validity of the author's claim (I recall a few situations where authors have given permission, then removed this at a later date dring a 'dummy spit' or similar), and actually removing the content. Generally it'll be 24-48 hours though.
As to the 'reserved' assets, there are several situations that have been discussed in the office which we think may be valid situations (a little tenuous, but we do see them as somewhat valid). As such, we are investigating this before we remove these assets. Apart from clogging up the DLS website a bit, they aren't causing any direct issues. However we are looking into this, and again we'll be looking to take action if we deem it necessary.
Regards